Towards a Dual City? Suburbanization and Centralization in Spain's Largest Cities

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doi:10.5477/cis/reis.176.35

               Towards a Dual City? Suburbanization
           and Centralization in Spain’s Largest Cities
                          ¿Hacia una ciudad dual? Suburbanización y centralización
                                             en las principales ciudades españolas
    José Manuel Torrado, Ricardo Duque-Calvache and Roberto Nogueras Zondag

Key words                    Abstract
Metropolitan Areas           Large cities and metropolitan areas are being transformed by different
• Centralization             migratory and economic processes and also, in a relevant way, by
• Gentrification             residential mobility. This study focuses on the latter, analyzing profiles
• Residential Mobility       of the participants in centralization and suburbanization movements in
• Urban Segregation          Madrid, Barcelona, Valencia, Seville and Bilbao, based on data from
• Suburbanization            the 2011 census. Using binomial logistic regression models, we have
• Suburbanization of         measured a greater tendency to seek out urban centers of middle
Poverty                      classes, educated population and people living in non-traditional
                             households. At the same time, there is a growing suburbanization
                             of young, working-class people involved in family projects. The
                             combination of both movements (which could be individually seen as
                             examples of social mix) is causing an increase in urban segregation,
                             now on a metropolitan scale.

Palabras clave               Resumen
Áreas metropolitanas         Las principales metrópolis están siendo transformadas por diferentes
• Centralización             procesos migratorios, económicos y también, de manera relevante, por
• Gentrificación             la movilidad residencial. Este trabajo se centra en esta última, analizando
• Movilidad residencial      los perfiles de los participantes en los movimientos de centralización
• Segregación urbana         y suburbanización en Madrid, Barcelona, Valencia, Sevilla y Bilbao, a
• Suburbanización            partir de los datos del censo de 2011. Utilizando modelos de regresión
• Suburbanización de         logística binomial, se ha constatado la mayor tendencia a buscar los
la pobreza                   centros urbanos de las clases medias, con estudios y en hogares no
                             convencionales, frente a una creciente suburbanización de jóvenes, de
                             clase trabajadora y embarcados en proyectos familiares. La combinación
                             de ambos movimientos (que tratados individualmente podrían
                             considerarse avances en la convivencia social) ocasiona un incremento
                             de la segregación urbana, pero ahora a escala metropolitana.

Citation
Torrado, José Manuel; Duque-Calvache, Ricardo and Nogueras Zondag, Roberto (2021). “Towards
a Dual City? Suburbanization and Centralization in Spain’s Largest Cities”. Revista Española de In-
vestigaciones Sociológicas, 176: 35-58. (doi: 10.5477/cis/reis.176.35)

José Manuel Torrado: Universidad de Huelva | jose.torrado@dstso.uhu.es
Ricardo Duque-Calvache: Universidad de Granada | ricardoduque@ugr.es
Roberto Nogueras Zondag: Universidad de Granada | rnogueras@protonmail.com

                          Reis. Rev.Esp.Investig.Sociol. ISSN-L: 0210-5233. N.º 176, October - December 2021, pp. 35-58
36                                            Towards a Dual City? Suburbanization and Centralization in Spain’s Largest Cities

Introduction1                                                   gan to grow significantly in Spain’s major ci-
                                                                ties (Módenes, 1998) and became their main
By the middle of the 20th century rural to ur-                  structuring element. Among the causes that
ban migration flows in the West had largely                     explain the emergence of these metropolitan
ceased and we find a resulting concentration                    processes in Spain, we find a combination of
of populations in and around major cities. The                  demographic, political economic and residen-
culmination of these urbanising processes led                   tial factors that are, to a great extent, found in
to the beginning of a new metropolitan era                      all areas of the country. The arrival of the age
in which the residential mobility of urban po-                  of emancipation of numerous Spanish baby-
pulations became the main factor structuring                    boom cohorts (Donat, 2010), the saturation
cities. Since then, the majority of Western ci-                 and inadequacy of the housing supply in the
ties have undergone processes of population                     main cities (López-Gay and Recaño, 2009)
growth, exceeding previous administrative                       and housing policy that favoured the cons-
boundaries and expanding their areas of in-                     truction of private market housing and access
fluence to increasingly distant municipalities.                 to home ownership (Leal and Martínez, 2016),
This reality has given rise to numerous stu-                    have all fostered an increase in suburbaniza-
dies on urban mobility in the Spanish (Feria,                   tion.
2010; Palomares-Linares, Feria and Susino,                           However, it was not until the first decade
2017) and international context (Cadwalla-                      of this century when this trend toward met-
der, 1992; Duhau, 2003). According to this                      ropolitanisation became more pronounced
research, residential mobility can be an in-                    (Palomares-Linares, Feria and Susino, 2017;
dicator of the state of development of urban                    Módenes, 2007; Nel-lo, 2004). Comittment
processes due to its dual nature: at the macro                  to a growth model at the end of the nineties
level these flows are the primary way in which                  based on the massive construction of hous-
cities grow and transform, while at the micro                   ing generated an expansionary economic cy-
level mobility is a social action taken by indi-                cle that, along with a policy of easy credit, led
viduals and households and shaped by their                      to a surge in new housing at ever increasing
desires, possibilities and limitations (Susino,                 prices (Górgolas, 2019). This dangerous com-
2003). As a result, the spatial relocation of in-               bination of an oversupply of housing and ris-
dividuals affects the social, economic and                      ing prices translated into an unprecedented
even physical structure of urban areas, so                      increase in suburbanization and led to central
that residential mobility becomes, in a broad                   cities becoming largely unaffordable for much
sense, an element of social change: “moving                     of the population of metropolitan areas (Leal,
within the city is moving the city” (Palomares-                 2002; Sorando and Leal, 2019). This was
Linares, 2017: 26). In the Spanish case, the                    further exacerbated by the speculative dy-
delay in urbanising processes in the country’s                  namics generated by urban regeneration and
main cities meant that the emergence of a                       functional reconversion policies implemented
new urban metropolitan structure arrived with                   at the end of the past century and beginning
a certain lag in comparison to other Euro-                      of this one (Antolín, Fernández-Sobrado and
pean countries (Cheshire, 1995). It was not                     Lorente-Bilbao, 2010; Díaz-Orueta, 2012). A
until the eighties when residential mobility be-                number of studies have emerged that have
                                                                revealed gentrification processes in the cen-
1 This paper is part of the research results of the             tres of Spain’s major cities (Díaz-Parra, 2009;
projects “Multi-methodological Approach to Residen-             Fernández, 2014). At the same time, others
tial Behaviour and Everyday Life (MARBEL)” (PID2020-            have identified a growing suburbanization of
119569GA-I00) and “Movilidad, Vivienda y Com-
portamiento Residencial en Andalucía (MOVICRA)”                 poverty and working classes (López-Gay and
(PY20_00571).                                                   Recaño, 2008, 2009; Torrado, 2018). These

Reis. Rev.Esp.Investig.Sociol. ISSN-L: 0210-5233. N.º 176, October - December 2021, pp. 35-58
José Manuel Torrado, Ricardo Duque-Calvache and Roberto Nogueras Zondag                                              37

are two complementary trends that seem to                     rred. In the first decade of this century there
reinforce a dual city model at the metropoli-                 were two contextual factors that conditioned
tan-level.                                                    the development of residential dynamics: the
     In this study we analyse whether resi-                   so-called real estate boom and the establis-
dential mobility at the beginning of the 21st                 hment of policies aimed at the functional re-
century may have contributed to deepen-                       conversion of spanish central cities. These
ing tendencies toward urban dualisation at                    two complex causal factors led to greater in-
the metropolitan level in Spain. To do this,                  equality and urban segregation (Díaz-Orueta,
we first examine the existing literature, fo-                 2012; Sorando and Leal, 2019).
cusing on two issues: the broad contextual                        It was, without a doubt, the growth in the
factors that may have contributed to proc-                    real estate market that took place between
esses of suburbanization and centralization,                  1998 and 2008 that had the greatest impact
and the relevant individual factors in subur-                 on residential mobility at the beginning of
ban and central city mobility. Subsequently,                  the century. Starting in 1998 public authori-
we examine how the aggregation of individ-                    ties committed to an economic development
ual choices can transform metropolitan ar-                    model primarily based on the massive and
eas. After, we specify the geographic areas,                  largely unregulated production of housing,
data sources and methodology employed.                        generating a real estate boom. The passage
Regarding geography, we focus on Spain’s                      in 1998 of a new Land Law made it easy to
major cities and metropolitan areas: Madrid,                  reclassify unprotected lands for development,
Barcelona, Valencia, Seville and Bilbao, as                   this, along with a loose credit policy and a
these are places where the processes de-                      housing policy that favoured access to home
scribed have had the greatest impact. Lastly,                 ownership and discouraged the construction
we analyse the role of movements of cen-                      of social housing, increased housing demand
tralization and suburbanization in the period                 in an artificial manner (Górgolas, 2019; Leal
2001 to 2011 through an analysis of their                     and Martínez, 2016). Along with this political-
profiles and determinants. With these data                    institutional framework, we must also con-
it is possible to reevaluate the impact these                 sider the emergence at the end of the nineties
                                                              and beginning of this century of a growing
processes had in the broader framework of
                                                              demand for housing fed by the massive in-
changes connected to the socioeconomic
                                                              flux of foreign immigration and large cohorts
and residential transformations that occurred
                                                              of young people entering the housing market
in Spain’s major metropolitan areas at the
                                                              (Módenes, 2007; Leal and Martínez, 2016).
beginning of this century. In addition, we re-
flect on how these residential movements                          The immediate result of this model was
may be currently fostering dualizing trends.                  a large and unbalanced increase in hous-
                                                              ing supply. This, however, did not translate
                                                              into a decline in housing prices due to the
Conceptual framework                                          artifical sustaining of demand resulting from
                                                              both easy access to credit and speculation
The structural context of residential                         (Górgolas, 2019). As a result, Spain’s main
mobility in Spain in the first decade of                      cities began a rapid expansion of their ter-
the 21st century                                              ritorial borders towards previously undevel-
                                                              opable land in adjacent municipalities; at
To understand the role of residential mobility                the same time, housing prices grew, partic-
in the transformation of Spain’s most impor-                  ularly in relation to wages. In this context of
tant metropolitan areas, we must first unders-                deregulation and a major expansion of the
tand the structural context in which it occu-                 housing market, metropolitan cities began

                             Reis. Rev.Esp.Investig.Sociol. ISSN-L: 0210-5233. N.º 176, October - December 2021, pp. 35-58
38                                            Towards a Dual City? Suburbanization and Centralization in Spain’s Largest Cities

to be structured into large spaces differen-                    Salguero-Montaño, 2012), such as the Uni-
tiated by levels of social prestige and, ulti-                  versal Exposition in Seville, the Olympic
mately, cost of housing (Leal, 2002; Sorando                    Games in Barcelona, the establishment of
and Leal, 2019). Each socioeconomic strata                      the Guggenheim Museum in Bilbao and the
was increasingly likely, given their economic                   City of Arts and Sciences in Valencia. Lastly,
and credit possibilities, to access a particu-                  broader marketing strategies to construct ur-
lar segment of the growing housing stock,                       ban identities (city-branding) in attempts to
leading to a substantial increase in urban                      position these cities within a global market of
social segregation. At the metropolitan level,                  cities were also a part of these policies. This
the cycle of an expanding housing market                        was a new model of “city as commodity”
translated into a larger suburbanising cy-                      that was justified by its alleged ability to at-
cle (Módenes, 2007; Nel-lo, 2004; Susino                        tract capital and skilled workers (Glaeser and
and Duque-Calvache, 2012). The central                          Gottlieb, 2006), but in practical terms it per-
cities of these metropolitan areas became                       mitted the rapid enrichment of a few at the
spaces of conflict, where extreme inequal-                      cost of long-term indebtedness for the gen-
ity existed within a small geographic area.                     eral population.
Certain neighborhoods became elite spaces                            The two contextual factors together re-
(García-Pérez, 2014; Sequera, 2013), inac-                      sulted in a growth in suburbanization proc-
cessible for much of the population, their                      esses, particularly among the less well-off,
less well-off inhabitants being pushed out.                     and the increasing centralization of the mid-
However, city centres still remain home to                      dle-classes (López-Gay and Recaño, 2008;
pockets of a poor and a marginalised popu-                      Torrado, 2018). The onset of the crisis meant
lation (in many cases, pending future gentri-                   the end of the expansive real estate cycle,
fication). Foreign immigrants often choose                      and with it, the end of a great wave of subur-
these locations because of their proximity to                   banization (Pujadas, Bayona and Gil-Alonso,
the service jobs that exist in central city ar-                 2012; Pujadas, López-Villanueva and Bayona,
eas and the continued existence of certain                      2016) and a resurgence in recentralising flows
low-priced housing. In general, this process                    (López-Gay, 2014, 2017). However, the crisis,
has allowed sectors of the traditional work-                    far from ameliorating dualising trends at the
ing-class that resided in central cities to sell                metropolitan level, seems to have increased
or rent their housing and move to neighbor-                     them (Jamoschka, 2018). It led to a collapse
hoods in better conditions in the surround-                     in housing prices in both areas distant from
ing metropolitan rings (Módenes, 2007).                         central cities and within the less desirable ar-
    In parallel with the urban and real estate                  eas of those cities. At the same time, city cen-
expansion taking place, public authorities                      tres only suffered a short period of adjustment
implemented policies aimed at the functional                    and saw a rapid return to increasing hous-
reconversion of the main cities of Spain’s                      ing values, which contributed to their ongoing
largest metropolitan areas (Antolín, Fernán-                    elitization in conjunction with the pauperiza-
dez-Sobrado and Lorente-Bilbao, 2010;                           tion of urban peripheries.
Díaz-Orueta, 2012). These policies often
took the form of new public-private inter-
ventions and platforms, such as the “Barce-                     Individual factors related to
lona model” at the beginning of the nineties,                   suburbanization and centralization and
the Bilbao Metropolis 30 Association and                        their aggregate effects
the Centre for Strategies and Development
in Valencia. They included mega-events                          The structural factors that we have des-
and mega-projects ( Rodríguez-Medela and                        cribed led to the specialisation and divi-

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José Manuel Torrado, Ricardo Duque-Calvache and Roberto Nogueras Zondag                                              39

sion of central cities and surroundings as                    zation, which was based on the middle
differentiated environments, leading them                     classes. The European literature is not as
to attract and push different sectors of the                  clear with respect to the link between these
population. However, for these major po-                      patterns of mobility and social class, given
pulation flows to appear, thousands of in-                    that European urban centres did not ex-
dividual decisions related to the mobility                    perience the same severe processes of
and immobility of households and persons                      abandonment and deterioration as US cities
were necessary. These decisions were ba-                      (Ullán, 2014). In the Spanish case, a signifi-
sed on individual preferences, possibilities                  cant aspect of suburbanization movements
and limitations. In a country in which signifi-               in the eighties and nineties was based on
cant proportions of the working classes had                   the movement of sectors of the middle
come to home ownership, a certain degree                      class (Susino and Duque-Calvache, 2012).
of resistance and negotiation over residen-                   In contrast, recent suburbanization proc-
tial changes was likely, and therefore, these                 esses have involved the working classes
changes were not as fast nor as dramatic as                   (López-Gay and Recaño, 2008; Torrado,
in other major cities in the world. Although                  2018), while centralization processes have
the profile of the populations involved in                    been based on the residential mobility of
both movements differs depending on the                       the educated middle classes (Susino and
historical moment being analysed, studies                     Duque-Calvache, 2012).
on choosing residential environments have                          Researchers have found greater agree-
tended to identify suburbanization and cen-                   ment in analysing the role of lifestyles. Sub-
tralization as opposing movements.                            urbanization tends to lead to an increase in
    With respect to the life course, subur-                   the distances between the spaces that are
banization has been found to be linked to                     part of daily life (work, home, commercial
the formation of the nuclear family house-                    centres, schools, etc.), in a search for resi-
hold; moving to the suburbs/metropolitan                      dential environments identified with such
rings is often chosen in anticipation of an                   things as nature, tranquility and safety, and
expanding household or in response to the                     the ownership of spacious homes fit for rais-
birth of a child (Michielin and Mulder, 2008).                ing children (Alberich, 2010; Fishman, 1987;
Regarding centralization, it has been char-                   Mieszkowski and Mills, 1993). In contrast,
acterised as a complementary movement,                        centralization is based on lifestyles seeking
specific to stages either prior to or poste-                  the closeness and concentration of daily in-
rior to the formation of the family (Torrado,                 teraction in more urban settings (Contreras,
2020). Thus, studies have found that move-                    2012). In this conception, centrality is a value
ments toward the central cities of metro-                     in itself; the location and symbolic value of a
politan areas are linked to both the eman-                    place is of greater importance than the hous-
cipation of young people and the choices                      ing (Pablos and Sánchez-Tovar, 2003). It is a
of older adults after the end of family life                  choice of individuals with a more individu-
projects in the metropolitan rings/suburbs                    alistic lifestyle, based on individual and pro-
(upon entering into the emply nest phase,                     fessional development (Schnell and Gracier,
or related to divorce or separation).                         1993). We could qualify those who subur-
    Regarding social class, there is more                     banise as having an “anti-urban” mentality,
controversy. A number of studies carried                      while those who centralize could be said to
out in the U.S. in the middle of the 20th cen-                have a “pro-urban” mentality. Although ulti-
tury identified centralization with the mo-                   mately, both are equally urban, as both life-
bility of the working classes (Nelson and                     styles are the result of the housing supply in
Edwards, 1993), in contrast to suburbani-                     metropolitan areas.

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40                                            Towards a Dual City? Suburbanization and Centralization in Spain’s Largest Cities

     What are the effects of these individ-                     bao. These cities were chosen because they
ual and group preferences and choices                           are at the top of the Spanish urban hierarchy
on the spaces of common life? If different                      (Feria, 2013) and are the ones where the pro-
forces converge in the same direction, is                       cesses of social division at the metropolitan
there a risk of the formation of a dual city,                   level associated with the real estate boom
with its outer rings increasingly proletarian-                  and functional reconversion have operated
ised and its urban centres increasingly gen-                    with the greatest force. We have chosen to
trified? The answer to this question is not                     analyse them together for two reasons: the
clear. Studies that have addressed the is-                      first and essential reason is to obtain a lar-
sue of segregation at the intra-urban scale                     ger sample size and, therefore, greater relia-
(usually at the level of census tract) have                     bility of our models. The second is to obtain
found contradictory results. While Sorando                      an overview of these phenomena in Spain’s
and Leal (2019) find that it is possible to                     largest cities and not one limited by the lo-
speak of tendencies toward the suburbani-                       cal context of each city, which would be the
zation of poverty and urban dualization,                        case if we studied them separately.
other authors (Porcel et al., 2018; Sarasa                          To reach our objectives we take two
et al., 2018) are sceptical about a relation-                   courses of action: 1) we analyse the profiles
ship between gentrification and the sub-                        of participants in each of the two residential
urbanization of poverty. However, the few                       movements, with the aim of identifying dif-
studies that have analysed the flows of                         ferent social groups’ preferences for the ur-
suburbanization and centralization in Spain                     ban core or outer rings of the metropolitan
seem to find arguments in favor of duali-                       area, and 2) we examine the individual de-
zation (López-Gay and Recaño, 2008; Tor-                        terminants of both centralization and sub-
rado, 2018). According to their authors, the                    urbanization movements to understand the
overall collective effect of these choices                      factors that either attact or push individuals
is shaping a dual city, in which the most                       to or away from metropolitan areas’ cen-
wealthy and skilled are attracted to the ur-                    tral cities. Our analysis of both movements
ban core, while the less skilled and poorly                     is based on an approach to processes of
situated social classes choose suburbaniza-                     metropolitan social reconfiguration already
tion. Therefore, it seems that the residential                  used by other authors (López-Gay and Re-
mobility of the population is not only modu-                    caño, 2008, 2009). Apart from the individ-
lated by an increasingly saturated housing                      ual impact of each type of movement, there
market in urban centres, but that, in paral-                    are combined effects from the existence
lel, it also contributes to segmenting urban                    of both, especially when they align (for ex-
space between metropolitan centres and                          ample, if the young adult population sub-
surrounding rings, leading to socio-spatial                     urbanizes and the older population central-
segregation, now on metropolitan scale.                         izes, the effect on the age structure is much
                                                                more accentuated).
                                                                    To carry out these two aims we use dif-
Objectives, scope, source and                                   ferent techniques. In the case of the first, a
methodology                                                     descriptive analysis the profiles of suburban
                                                                and central city movers is enough, while for
The aim of this study is to understand the                      the second objective, we use binary logis-
role that centralization and suburbanization                    tic regression. The use of the latter to cal-
have played in the socio-spatial reconfigu-                     culate the determinants of suburbanization
ration of five of Spain’s largest cities: Ma-                   and centralization allows us to operation-
drid, Barcelona, Valencia, Seville and Bil-                     alise these movements in a way that ap-

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José Manuel Torrado, Ricardo Duque-Calvache and Roberto Nogueras Zondag                                              41

proximates the actual process of residential                  tion about residential mobility during the
choice (ultimately, changing place of resi-                   2001-2011 period. We have used this ques-
dence is a choice one either makes or does                    tion, covering a period further back in time
not make) and to analyse the individual ef-                   (instead of one regarding mobility in the
fect that the variables considered have on                    year prior to the census), because it re-
the likelihood that a subject will choose to                  flects more established trends, especially
change residence or not. We constructed                       when we consider that, due to the crisis,
two regression models, one for analysing                      2010 was a year with low mobility. The first
the choice to reside in urban centres (cen-                   variable captures the decision to centralize:
tralization), and the other for the choice to                 moving from an outer ring toward the cen-
reside in outer rings (suburbanization). The                  tre (value 1) versus the likelihood of having
two models have different sub-samples, as                     carried out one of the other possible alter-
the first includes those that at the beginning                natives: moving within or remaining seden-
of the period examined resided in the outer                   tary in the surrounding metropolitan area
rings, and the second, those that resided                     (value 0). The second variable refers to the
in the city centre. To compare the results of                 decision to suburbanise, to move from the
two models based on different subsamples,                     centre toward the outer rings (value 1), ver-
we calculated the average marginal effects                    sus the likelihood of having carried out one
(dy/dx), estimates that are usually employed                  of the alternatives: moving within or remain-
for this end (Williams, 2012).                                ing sedentary in the central city (value 0).
    Our data source is Spain’s 2011 Popu-                        For the variables that refer to the char-
lation and Housing Census, which provides                     acteristics of the individuals that carry out
us with microdata that was used by Feria                      both movements, we have used all that the
and Martinez (2016) to delimit Spain’s met-                   census permits and grouped them into five
ropolitan areas. Using their boundaries al-                   blocks:
lows us to differentiate residential move-
                                                              1) Indicators related to the life course and
ments from migrations, which is particularly
                                                                 basic demographic indicators: age, sex,
useful in working with metropolitan areas
                                                                 marital status and household structure.
that include municipalities in different prov-
inces (such as Madrid and Barcelona), as                      2) Social position: education level and em-
well as in distinguishing between munici-                        ployment and occupational status.
palities that are central and those part of                   3) Lifestyles: number of domestic tasks ca-
an outer ring. The latter allows us to iden-                     rried out, ownership of second residency
tify the origins and destinations of residen-                    and place of work2.
tial movements and thus differentiate sub-                    4) Prior residential trajectory: place of birth.
urbanization and centralization movements.
                                                              5) Housing characteristics: tenure status
In addition, the census also includes a wide
                                                                 (ownership or rental), size and age of
range of individual variables that allow us to
                                                                 housing3.
extend our characterisation of the individu-
als involved in these residential movements
beyond the basic demographic variables
                                                              2 We are aware of the limitations of these variables;
(sex and age) considered in other data-
                                                              however, we think it makes sense to include them in
bases (such as the spanish Residential Vari-                  this study due to the absence of other sources that we
ation Statistics).                                            can use regarding these issues.
                                                              3 The inclusion of this block allows us to explore the
   Regarding the dependent variables in
                                                              housing conditions to which both types of mobile indi-
the models, we have used two dummy vari-                      viduals have access, which is an idicator of the quality
ables constructed based on a census ques-                     of life they will enjoy after the movement.

                             Reis. Rev.Esp.Investig.Sociol. ISSN-L: 0210-5233. N.º 176, October - December 2021, pp. 35-58
42                                            Towards a Dual City? Suburbanization and Centralization in Spain’s Largest Cities

    Lastly, it must be noted that the sub-                      of suburbanization, as there are many fami-
samples used exclude those under 16 years                       lies with children in this process. Secondly,
of age, for two reasons: first, because these                   centralization actually involves both older and
individuals do not, in general, decide for                      younger persons than in the case of suburba-
themselves to change residence and, sec-                        nization, but the average age hides this fact.
ondly, because they are not included in the                     There is no single process of centralization,
variables that indicate social position.                        but rather different centralizing trends (To-
                                                                rrado, 2020). Regarding household structure
                                                                and marital status, both indicate that subur-
Results                                                         banization is a more family-based process,
                                                                in contrast to centralization, which involves a
Profiles of participants in                                     higher presence of unmarried and divorced
suburbanization and centralization                              persons, as well as individuals living in non-
                                                                traditional households. Central cities seem to
Regarding the life course indicators, the simi-                 be spaces for transitional stages, as well as
larity in the average age of individuals partici-               refuges for a broad range of households that
pating in suburbanization and centralization                    have broken with the nuclear family structure.
(Table 1) is surprising. There are two reasons                  This is in contrast with the outer rings that
for this: first, the data does not include those                constitute a reproductive space which, to a
under 16 years of age, there inclusion would                    much greater extent, attracts married persons
significantly lower the average age in the case                 and families with small children.

Table 1. Profiles of residential mobility: life courses (%)

                                                      Suburbanization             Centralization           Differences

 Age (mean)                                                  39.7                       39.1                    –0.6

 Sex
  Man                                                         51                         51                       0
  Woman                                                       49                         49                       0

 Marital status
  Single                                                      36                         44                       7
  Married                                                     53                         42                     –11
  Widowed                                                      3                          3                       0
  Separated or divorced                                        7                         11                       4

 Type of household
  Single-person                                               10                         14                       4
  Non-family                                                   1                          4                       3
  Single parent with young children                            4                          5                       1
  Single parent with grown children                            2                          3                       1
  Couple without children                                     22                         23                       1
  Couple with young children                                  45                         31                     –14
  Couple with grown children                                   3                          3                       0
  Other families                                              12                         16                       4
Source: By authors based on the 2011 Population and Housing Census.

Reis. Rev.Esp.Investig.Sociol. ISSN-L: 0210-5233. N.º 176, October - December 2021, pp. 35-58
José Manuel Torrado, Ricardo Duque-Calvache and Roberto Nogueras Zondag                                              43

    A look at the characteristics of the hous-                larger living spaces that are better suited
ing accessed in shifting residence (Table 2)                  to their needs and preferences. Residen-
reveals important differences between both                    tial mobility is affected by so-called room
movements. We find that those involved in                     stress. Another difference is the easy ac-
suburbanization reside in much newer and                      cess in the outer rings to home ownership,
larger housing stock. This is related to two                  especially through credit. Centralization
phenomena: first, the different characteris-                  again reveals the existence of certain inter-
tics of the housing stock in centre cities and                nal differences within this population group,
outer rings, and secondly, the characteris-                   with a somewhat high proportion of fully
tics of the households. In contrast to cen-                   owned homes along with a high percentage
tralizers, suburbanisers moving to the outer                  of renters, which seems to be linked to dif-
rings, often with children, are able to find                  ferent life and residential trajectories.

Table 2. Profiles of residential mobility: characteristics of principal housing (%)

                                                 Suburbanization            Centralization            Differences

Type of tenancy
 Fully paid ownership                                    13                       17                         4
 Property under mortgage                                 69                       47                       –22
 Rental                                                  13                       27                        14
 Ceded property                                           5                        9                         4

Size of housing
 Less than 76 sq m                                       28                       52                        25
 76 to 89 sq m                                           26                       25                        –1
 90 to 120 sq m                                          22                       15                        –7
 More than 120 sq m                                      25                        8                       –17

Age of housing
 Before 1940                                              2                       12                        10
 1940 to 1960                                             4                       14                        10
 1961 to 1970                                             8                       19                        10
 1971 to 1980                                            16                       15                        –1
 1981 to 1990                                             9                        6                        –3
 1991 to 2001                                            20                       10                       –10
 After 2001                                              41                       23                       –17
Source: By authors based on the 2011 Population and Housing Census.

   Regarding lifestyle indicators (Table 3),                  ments, which seems to point toward the
we find that suburbanization involves the                     hypothesis of sociospatial polarisation be-
dispersion of life spaces, including a clear                  tween central cities and rings. Thus, we
separation between location of residence                      see a centralization in which professionals
and work. This contrasts with centralization,                 and individuals with university education
which tends to reduce daily movements.                        are more prominent, suggesting a move-
There are no major differences in regards to                  ment of a skilled middle class. In contrast,
second residencies and domestic tasks.                        in suburbanization this class is less present.
    Regarding social class (Table 4), we also                 Workers and individuals with secondary
find interesting differences. We see a cer-                   education, to a greater extent, choose the
tain complementarity between both move-                       metropolitan rings.

                             Reis. Rev.Esp.Investig.Sociol. ISSN-L: 0210-5233. N.º 176, October - December 2021, pp. 35-58
44                                            Towards a Dual City? Suburbanization and Centralization in Spain’s Largest Cities

Table 3. Profiles of residential mobility: lifestyles (%)

                                                  Suburbanization              Centralization              Differences

Average No. domestic tasks                                  0.9                      0.8                        –0.1

Have a second residency
 Yes                                                        36                        38                          2
 No                                                         64                        62                         –2

Location of workplace
 Same municipality                                          14                        41                         27
 Another municipality                                       47                        21                        –26
 Outside the area                                            2                         2                          0
 Various municipalities                                      5                         5                          0
 At home                                                     5                         6                          1
 Neither studying or working                                27                        26                         –1
Source: By authors based on the 2011 Population and Housing Census.

Table 4. Profiles of residential mobility: social position (%)

                                                  Suburbanization              Centralization              Differences

Education level
 Primary or below                                           10                        10                          0
 Compulsory secondary                                       19                        20                          0
 Vocational or Upper secondary                              33                        30                         –2
 University                                                 32                        40                          8

Occupation/activity
 Professionals                                              27                        32                          5
 Administrators                                             20                        20                          0
 Other service workers                                      11                        12                          2
 Operators                                                  11                        10                         –1
 Business owners                                             7                         7                          0
 Unemployed                                                  1                         1                          0
 Inactive                                                   16                        16                          0
 Other jobs                                                  1                         1                          0
Source: By authors based on the 2011 Population and Housing Census.

    As we can see, suburbanization and                            it does not allow us to see the isolated ef-
centralization reinforce the trend of a ris-                      fects of different variables, as many are, to
ing socioeconomic level among central city                        some extent, correlated. As a result, it is
inhabitants and the peripheralisation of the                      necessary to take an additional step and
working classes. However, this initial im-                        analyse the determinants of these move-
age is very affected by the class structure                       ments, in this way controlling for structural
of the specific places of origin of the par-                      effects and isolating the contribution of in-
ticipants in residential flows. In addition,                      dividual variables.

Reis. Rev.Esp.Investig.Sociol. ISSN-L: 0210-5233. N.º 176, October - December 2021, pp. 35-58
José Manuel Torrado, Ricardo Duque-Calvache and Roberto Nogueras Zondag                                              45

Determinants of suburbanization and                               If we consider the three life course var-
centralization                                                iables together, we obtain a view of the
                                                              overall effect of these two forms of mobil-
The models (Table 5) reveal themselves to                     ity on the structure of the urban popula-
be solid overall, both in terms of their sta-                 tion. On the one hand, older persons move
tistics of fit and the significance of the va-                to the centre, linked to changing household
riables. The model for suburbanization fits                   structures and to non-family households,
slightly better, which strengthens the idea                   but couples without children also have im-
that centralization is a more internally di-                  portance in these residential flows. On the
verse movement.                                               other hand, younger adults, married cou-
   The age variable is significant in both                    ples and families in stages of household
models, but in opposite directions. Both                      expansion move to the rings of metropoli-
types of residential mobility therefore feed                  tan areas. From a demographic perspec-
the socio-demographic processes of age-                       tive, the overall effect is the rings are reju-
ing in centre cities, especially if we consider               venated and central cities age.
that those that suburbanise are more likely                       The social consequences of residential
to be in phases of child-raising and house-                   mobility are even clearer. Education level op-
hold expansion.                                               erates in a linear manner in both movements
    In both movements there is a strong                       (see Graph 2). The central cities concentrate
presence of divorced, separated and wid-                      the more educated population. The result is,
owed persons, which is explained by the                       to a certain extent, counterintuitive, as the
greater mobility of persons after the dissolu-                central cities, which concentrate the major-
tion of their households. However, the mar-                   ity of universities, do not see their graduates
ginal effects of these categories are much                    dispersing toward the rings but rather attract
greater in the case of centralization (double                 them. The combined effect boosts educa-
for the case of widowed persons and triple                    tion levels in the central cities and reduces
in the case of those who are divorced and                     the education levels of the population in the
separated). Central cities are more attrac-                   metropolitan rings, although the relatively re-
tive places for reconstructing lives after the                duced volume of the population that partici-
breakdown of a household. Regarding be-                       pates in these changes each year limits our
ing single, it is only significant and nega-                  perception of this process.
tively correlated in the case of suburbani-                       Employment and occupational status
zation: the rings are not very interesting for                (Graph 2) also follow a linear distribution, ex-
people who are single.                                        cept for the group of employers. Although
    Regarding household structure, its ef-                    the position of businessman/woman tends to
fects (Graph 1) are related with marital sta-                 be related with the middle classes and upper
tus. Centralization is more likely in non-                    middle classes in the collective imaginary,
family households, other households and                       the reality of the productive fabric in Spain
among couples without children. In con-                       and the outsourcing of services means that
trast, the only tendency in suburbanization                   the majority of the persons in this category
that stands out is households of childless                    are self-employed and owners of precari-
couples. While living in a family context is                  ous small businesses, with conditions closer
shown, as would be expected, to be a lim-                     to those of workers than to heads of larger
iting factor for both movements, it is much                   sized businesses. Overall, residential mobility
more so in the case of centralization, con-                   between the rings and central cities leads to
firming the more familist character of the                    a concentration of professionals in the cen-
suburbanization process.                                      tres and the exit of workers to the suburbs.

                             Reis. Rev.Esp.Investig.Sociol. ISSN-L: 0210-5233. N.º 176, October - December 2021, pp. 35-58
46                                            Towards a Dual City? Suburbanization and Centralization in Spain’s Largest Cities

Table 5. Models for explaining suburbanization and centralization in Spain’s principal metropolitan areas

                                                              Centralization                       Suburbanization

                                                         dy/dx (%)              SE               dy/dx (%)             SE

Age                                                         0.04***          0.0001               –0.01***           0.0000
Age-squared                                                 0.00***          0.0000                0.00              0.0000

Sex (ref.=Woman)
 Man                                                        0.16***          0.0002                0.04***           0.0001

Marital status (ref.=Married)
 Single                                                     0.04             0.0003               –0.10***           0.0001
 Widowed                                                    0.41***          0.0006                0.23***           0.0002
 Divorced/Separated                                         0.62***          0.0004                0.22***           0.0002

Household type (ref.=Single-person)
 Non-family                                                 0.76***          0.0008                0.01              0.0004
 Single parent with under-age children                     –0.39***          0.0006               –0.32***           0.0002
 Single parent with grown children                         –0.23***          0.0006               –0.45***           0.0003
 Couple without children                                    0.18***          0.0004                0.20***           0.0002
 Couple with under-age children                            –0.31***          0.0004               –0.14***           0.0002
 Couple with grown children                                –0.89***          0.0006               –0.48***           0.0002
 Other families                                             0.27***          0.0004               –0.07***           0.0002

Education level (ref.=Primary or below)
 Secundary/Compulsory secondary                             0.23***          0.0004               –0.07***           0.0002
 Upper secondary/Vocational                                 0.59***          0.0004               –0.09***           0.0002
 University                                                 1.29***          0.0005               –0.24***           0.0002

Occupation/activity (ref.=Administrators)
 Professionals                                              0.18***          0.0003               –0.05***           0.0001
 Other service workers                                     –0.07             0.0004                0.03*             0.0002
 Operators                                                 –0.49***          0.0004                0.06**            0.0002
 Business owners                                           –0.14**           0.0005                0.03              0.0002
 Unemployed                                                –0.59***          0.0011               –0.27***           0.0004
 Inactive                                                  –0.09*            0.0004               –0.22***           0.0002
 Other occupations                                          0.16             0.0010               –0.09              0.0005

No. domestic tasks                                         –0.08***          0.0002                0.10***           0.0001

Have second residencies (ref.=No)
 Yes                                                        0.23***          0.0002               –0.18***           0.0001

Location of workplace or place of study (ref.=Same municipality)
  Other municipality                                       –1.39***          0.0003                1.48***           0.0001
  Outside the area                                         –0.92***          0.0008                0.83***           0.0003
  Various municipalities                                   –0.74***          0.0006                0.94***           0.0002
  At home                                                  –0.56***          0.0005                0.68***           0.0002
  Neither studying or working                              –0.71***          0.0003                0.85***           0.0001

Tenancy (ref.=Property under mortgage)
 Fully paid property                                       –0.76***          0.0003               –0.85***           0.0001

Reis. Rev.Esp.Investig.Sociol. ISSN-L: 0210-5233. N.º 176, October - December 2021, pp. 35-58
José Manuel Torrado, Ricardo Duque-Calvache and Roberto Nogueras Zondag                                                47

Table 5. M
          odels for explaining suburbanization and centralization in Spain’s principal metropolitan areas (Con-
         tinuation)

                                                             Centralization                     Suburbanization

                                                         dy/dx (%)            SE             dy/dx (%)             SE

  Rental                                                   0.66***         0.0003              –0.27***         0.0001
  Ceded and other forms                                    0.26***         0.0004              –0.37***         0.0002

Place of birth (ref.=Central city)
 Metropolitan ring                                        –1.21***         0.0003               0.11***         0.0002
 Other city                                               –0.57***         0.0005              –0.46***         0.0002
 Other ring                                               –1.51***         0.0011              –0.15***         0.0003
 Outside of metropolitan area                             –0.74***         0.0004              –0.16***         0.0001
 Foreigner                                                 0.12**          0.0004               0.36***         0.0002

Residency size (ref.=Less than 75 m²)
  76 to 90 m²                                             –0.42***         0.0003               0.12***         0.0001
  91 to 120 m²                                            –0.71***         0.0003               0.31***         0.0001
  More than 120 m²                                        –1.31***         0.0004               0.83***         0.0001

Age of housing (ref.=Before 1940)
 1940 to 1960                                             –0.34***         0.0005               0.18***         0.0003
 1961 to 1970                                             –0.92***         0.0004               0.44***         0.0003
 1971 to 1980                                             –1.65***         0.0004               0.82***         0.0003
 1981 to 1990                                             –1.76***         0.0005               0.89***         0.0003
 1991 to 2001                                             –1.86***         0.0005               1.15***         0.0003
 After 2001                                               –1.13***         0.0004               1.43***         0.0003

N                                                                         505.613                             401.128
Sig                                                                         0.000                               0.000
Log-Lik empty model                                                      –907.388                          –1.837.000
Log-Lik full model                                                       –705.601                          –1.224.000
Pseudo R²                                                                   0.220                               0.330

Note: ***p-valor
48                                                                  Towards a Dual City? Suburbanization and Centralization in Spain’s Largest Cities

Graph 1. M
          arginal effects on the probability of suburbanization and centralization based on household structure
         (%)

           1.00                                                                                                                              Suburbanization
           0.80

           0.60

           0.40

           0.20

           0.00

          –0.20

          –0.40

          –0.60

          –0.80

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          1.00                                                                                                                            Centralization

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Source: By authors based on the 2011 Population and Housing Census.

     The models also suggest two clearly dif-                                                     ences in lifestyles should not be interpreted
ferentiated lifestyles linked to residential mo-                                                  in an isolated manner, as they fit well with
bility. Centralization is associated with a life-                                                 what we have seen regarding the life course
style based on residential and workplace                                                          and class position. It is more typical of indi-
proximity, while the suburban lifestyle is char-                                                  viduals in transitional stages of the life course
acterised by a growing fragmentation of the                                                       and of the middle-class to focus more on lei-
spaces of daily life. However, these differ-                                                      sure and work, and to integrate the different

Reis. Rev.Esp.Investig.Sociol. ISSN-L: 0210-5233. N.º 176, October - December 2021, pp. 35-58
José Manuel Torrado, Ricardo Duque-Calvache and Roberto Nogueras Zondag                                              49

spaces of daily social interaction. Suburbani-                (availability of a second residence and the
zation, which is more family-based, privileges                number of household tasks carried out) are
the type and size of housing, even at the cost                less easy to interpret and, as we have seen
of necessitating more daily movements. The                    in the descriptive part of this text, appear to
rest of the variables included in the model                   have much less of an overall effect.

Graph 2. Marginal effects on the probability of suburbanization and centralization based on education level (%)

             0.00                                                                   Suburbanization

             –0.10

             –0.10

             –0.20

             –0.20

             –0.30

             –0.30
                        Compulsory secondary          H.S. grad/Vocational            University ed.

             1.60                                                                Centralization

             1.40

             1.20

             1.00

             0.80

             0.60

             0.40

             0.20

             0.00
                        Compulsory secondary          H.S. grad/Vocational            University ed.

Source: By authors based on the 2011 Population and Housing Census.

                             Reis. Rev.Esp.Investig.Sociol. ISSN-L: 0210-5233. N.º 176, October - December 2021, pp. 35-58
50                                            Towards a Dual City? Suburbanization and Centralization in Spain’s Largest Cities

Graph 3. M
          arginal effects on the probability of suburbanization and centralization based on employment and
         occupational status (for main categories) (%)

      0.10                                                                                   Suburbanization

      0.10

      0.10

      0.10

       0.00

       0.00

       0.00

       0.00

       0.00

      –0.10

      –0.10

      –0.10
                     Professionals            Other services                Operators               Business owners

      0.30                                                                                   Centralization

      0.20

      0.10

      0.00

      –0.10

      –0.20

      –0.30

      –0.40

      –0.50

      –0.60

      –0.70
                     Professionals            Other services                Operators               Business owners

Source: By authors based on the 2011 Population and Housing Census.

    We have not included a specific analysis                    ence and migrations, as both suburbaniza-
of prior residential trajectory because it does                 tion and centralization movements seem to
not have contrary effects on suburbanization                    be closely linked to two types of prior trajec-
and centralization, as do other variables.                      tories. On one hand, there are movements of
However, it is important to connect it with                     return by prior residents, and on the other,
the broader contexts of residential experi-                     the mobility of foreigners. Although the link

Reis. Rev.Esp.Investig.Sociol. ISSN-L: 0210-5233. N.º 176, October - December 2021, pp. 35-58
José Manuel Torrado, Ricardo Duque-Calvache and Roberto Nogueras Zondag                                              51

of centralization with the return of prior resi-                tance of having grown up in a certain type
dents is an established thesis in the litera-                   of urban space and its relation to a concep-
ture, the importance of these trajectories in                   tion of an ideal space for future phases of
suburbanization is a new finding that would                     life. For their part, the greater likelihood of
be interesting to explore further. Perhaps                      foreigners participating in both movements
the most appropriate approach would be                          reflects a general pattern of greater mobility
qualitative research to explore the impor-                      among this population group.

Graph 4. Marginal effects on the probability of suburbanization and centralization based on place of work (%)

             1.60                                                                     Suburbanization

             1.40

             1.20

             1.00

             0.80

             0.60

             0.40

             0.20

             0.00
                      Other municipality     Outside the area      Several municipalities        At home

             0.00                                                                           Centralization

            –0.20

            -0.40

            –0.60

            –0.80

            –1.00

            –1.20

            –1.40

            –1.60
                      Other municipality     Outside the area      Several municipalities        At home

Source: By authors based on the 2011 Population and Housing Census.

                             Reis. Rev.Esp.Investig.Sociol. ISSN-L: 0210-5233. N.º 176, October - December 2021, pp. 35-58
52                                            Towards a Dual City? Suburbanization and Centralization in Spain’s Largest Cities

Graph 5. Marginal effects on the probability of suburbanization and centralization based on housing age (%)

                         1.60

                         1.40

                         1.20

                         1.00

                         0.80

                         0.60

                         0.40

                         0.20

                         0.00
                                 1940 to   1961 to     1971 to    1981 to     1991 to      after
                                  1960      1970        1980       1990        2001        2001

                         0.00

                        –0.50

                        –1.00

                        –1.50

                        –2.00

                        –2.50
                                1940 to    1961 to     1971 to    1981 to     1991 to     after
                                 1960       1970        1980       1990        2001       2001

Source: By authors based on the 2011 Population and Housing Census.

    Lastly, we have variables referring to                       and new housing. Centralization is more di-
housing stock: type of tenancy, age and                          verse, and includes an important propor-
size. Suburbanization as a movement is as-                       tion of rental housing and the search for
sociated with access to property, mainly                         smaller and older housing. These patterns
through credit in the form of mortgages, as                      are related to the differences in the housing
well as with the search for more spatious                        stock in central cities and metropolitan rings,

Reis. Rev.Esp.Investig.Sociol. ISSN-L: 0210-5233. N.º 176, October - December 2021, pp. 35-58
José Manuel Torrado, Ricardo Duque-Calvache and Roberto Nogueras Zondag                                              53

but also reflect individual conditioning and                       First is the usefulness of contrasting
preferences. In the case of suburbanization,                  these two main residential dynamics that
the importance of family life and parenting                   mark metropolitan development as they
projects encourage the search for residential                 have often been examined independently.
stability and longterm investment in housing.                 Both the centralization of the skilled middle
In terms of centralization, the more transitory               classes and the suburbanization of working
nature of certain periods of the life course                  class sectors that our results reveal have
are related to the preference for renting, and                been considered by a part of the literature
access to smaller housing is explained by                     as positive trends (Lees, 2008). This is be-
the characteristics of these households, usu-                 cause, on the one hand, they foster social
ally smaller and less conventional. In addi-                  coexistence among different social groups
tion, the general preference that centralisers                and the revaluation of stigmatised spaces
seem to have for older housing (built prior to                (an objective frequently labelled as “social
1940) does not seem to be explained by the                    mix” in the Anglo-Saxon literature); on the
characteristics of the housing stock in cen-                  other, because they reflect the rising social
tral cities, as this segment of the stock barely              mobility of workers and their access to mid-
accounts for 6.5% of housing in the cities                    dle-class patterns of consumption. How-
analysed. Therefore, it is probably a result                  ever, the overall effect of both tendencies,
of the preferences of individuals who move                    in parallel with other social forces, con-
to central cities for older housing located,                  tributes to the shaping of a divided urban
in general, in or around historic city centres                space: metropolitan areas of increasingly
and with a certain architectural value. As a                  exclusive central cities and rings that serve
result, if we consider this tendency to live in               as refuge for their former working class in-
historic buildings, with their elevated social                habitants. Given that the centres are also
profile, it seems clear that centralization is a              the location of the best jobs and the best
movement closely linked, at least in the five                 educational opportunities and that distance
metropolitan areas analysed, to processes of                  continues being an important factor limiting
gentrification. It should also be mentioned,                  access, residential mobility raises important
however, that in addition to housing in build-                challenges in urban planning and manage-
ings of historical value, there are also cen-                 ment if we want to avoid new problems re-
tralizing flows that seek newer housing, thus,                sulting from the peripheralisation of poverty.
in the cases studied, gentrification coexists                 The increasing deterioration and system-
with processes of urban regeneration and                      atic lack of investment in metropolitan pub-
the occupation of previously industrial or va-                lic transport at a time when its users are in-
cant urban spaces.                                            creasingly poorer is no coincidence.
                                                                  Secondly, we think that we can learn cer-
                                                              tain lessons regarding the recent past and
Conclusions: toward a dual                                    suggest certain future trends based on our
city?                                                         findings. The housing and urban regeneration
                                                              policies applied during the real estate boom,
The joint and systematic analysis of the                      which covered the majority of the period an-
characteristics and determinants of subur-                    alysed, generated a deregulated process of
banization and centralization movements in                    residential mobility. The absence of social
Spain’s largest metropolitan areas in a pe-                   housing policy, along with the real estate cri-
riod of both economic expansion and crisis,                   sis, resulted in a substantial increase in ur-
has led us to two essential and closely rela-                 ban social segregation in Spain’s main cit-
ted findings.                                                 ies (Sorando and Leal, 2019). Based on our

                             Reis. Rev.Esp.Investig.Sociol. ISSN-L: 0210-5233. N.º 176, October - December 2021, pp. 35-58
54                                            Towards a Dual City? Suburbanization and Centralization in Spain’s Largest Cities

results, this segregation has begun to man-                     Contreras, Yasna (2012). Cambios socio-espacia-
ifest on the metropolitan scale. The rise in                      les en el centro de Santiago de Chile: Formas de
                                                                  anclarse y prácticas urbanas de los nuevos habi-
housing prices in the central cities, fuelled by
                                                                  tantes. Dureau, Francoise and Mattos, Carlos de
processes of urban regeneration and gentri-
                                                                  (dirs.), Chile: Pontificia Universidad Católica de
fication, along with the large supply of hous-                    Chile. [Doctoral Thesis].
ing available in the suburbs, have resulted                     Cooke, Thomas J. (2010). “Residential Mobility of
in contrasting dynamics of a centralization                       the Poor and the Growth of Poverty in Inner-Ring
of wealth and a suburbanization of poverty.                       Suburbs”. Urban Geography, 31(2): 179-193. doi:
Although these dynamics were still just in-                       10.2747/0272-3638.31.2.179
cipient in the period we have examined, cur-                    Díaz-Orueta, Fernando (2012). “Periferias urbanas y
rently Spain’s main cities are located within                      reconfiguración de las políticas urbanas en Es-
a similar framework as the world’s major cit-                      paña”. Gestión y Política Pública, 21: 41-81.
ies in terms of urban social problems (Cook,                    Díaz-Parra, Ibán (2009). “Procesos de gentrificación
2010; Hochstenbach and Musterd, 2018).                             en Sevilla en la coyuntura reciente. Análisis com-
                                                                   parado de tres sectores históricos: San Luis-Ala-
The continuance of housing polices that fed
                                                                   meda, Triana and San Bernardo (2000-2006)”.
the real estate boom (Leal and Martínez,                           Scripta Nova: Revista Electrónica de Geografía y
2016), the deepening of gentrification proc-                       Ciencias Sociales, 13(304).
esses (Janoschka, 2018), along with new                         Donat, Carles (2010). “La incidencia de las dinámi-
processes of touristification that affect cen-                    cas demográficas en las necesidades residen-
tral cities (Sequera, 2013), seem to suggest                      ciales y en la oferta de vivienda en la Región Me-
that, far from slowing down, these trends                         tropolitana de Barcelona”. Ciudad y Territorio.
shaping a dual city could speed up in the fu-                     Estudios Territoriales, 174: 1-18.
ture. Lastly, the forgotten medium-sized and                    Duhau, Emilio (2003). “División social del espacio
small cities should be mentioned. While the                       metropolitano y movilidad residencial”. Papeles
                                                                  de Población, 9(36): 161-210.
largest cities are now immersed in seemingly
                                                                Feria, José M. (2010). “La movilidad residencial y
irresoluble processes of dualisation and seg-
                                                                   los procesos de urbanización metropolitanos
regation, it may not be too late to succeed in
                                                                   en España”. In: Feria, J. M. and Albertos, J. M.
shaping more socially just and integrated cit-                     (coords.). La ciudad metropolitana en España:
ies among those of smaller sizes.                                  procesos urbanos en los inicios del siglo xxi .
                                                                   Madrid: Thompson-Routers.
                                                                Feria, José M. (2013). “Towards a Taxonomy of
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  10.1080%2F00420989550012564                                     34022014000200005

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