Spanish Global Cities Are Becoming More Segregated

The Barcelona You Remember Is Already Gone

Walk through the Gothic Quarter on a Saturday afternoon and you will see two cities superimposed. One is the city of narrow medieval streets, of grandmothers hanging laundry, of the corner bar where the same man has ordered the same coffee for forty years. The other is a city of Airbnb keyboxes, of boutique hotels where the receptionist speaks no Catalan, of apartment blocks where the only residents who can afford the rent are digital nomads earning in euros and spending in dollars.

This is not a feeling. It is a measurable fact.

A new study by Álvaro Mazorra Rodríguez (2024), published in the journal Cities, has tracked exactly how Madrid, Barcelona, and Valencia have changed between 2001 and 2021. The results are stark. Spanish global cities are not just becoming more unequal. They are becoming more segregated. Rich and poor are physically pulling apart, neighborhood by neighborhood, census tract by census tract, in ways that were not true twenty years ago.

And the engine driving this separation is not what most people think.

What Mazorra Rodríguez Actually Measured

The study uses Spain's national census data from 2001, 2011, and 2021. That is a goldmine. Spain conducts its census with a level of geographic granularity that allows researchers to zoom down to the sección censal, a statistical unit of roughly 1,000 to 2,500 people. Mazorra Rodríguez analyzed data from 2,386 of these sections across the three cities.

He measured two things. First, social inequality: how much income and education levels vary between the richest and poorest residents overall. Second, residential segregation: how evenly or unevenly those different groups are distributed across the city.

The method is standard in urban sociology. It uses something called the dissimilarity index, which measures what percentage of one group would have to move to a different neighborhood to achieve an even distribution across the city. A score of 0 means perfect integration. A score of 100 means total apartheid.

What Mazorra Rodríguez found was that every single city moved in the wrong direction.

The Numbers That Should Alarm You

In Madrid, the dissimilarity index for the highest versus lowest income groups rose from 42.3 in 2001 to 48.7 in 2021. In Barcelona, from 39.1 to 44.8. In Valencia, from 36.7 to 42.1 (Mazorra Rodríguez, 2024).

These are not dramatic jumps. They are slow, grinding shifts. But they are consistent. They are happening in all three cities simultaneously. And they are accelerating.

The pattern is the same everywhere. The wealthy are concentrating in central districts and along the prime coastal zones. The poor are being pushed to the periphery. The middle class, once the backbone of Spanish urban life, is shrinking and fragmenting.

Consider Barcelona's Eixample district. In 2001, it was mixed. Professionals lived next to shopkeepers. In 2021, it had become a zone of extreme concentration for university educated residents earning above the national median. Meanwhile, neighborhoods like Nou Barris and Sant Andreu saw their share of low income residents rise by 12 and 9 percentage points respectively (Mazorra Rodríguez, 2024).

Madrid tells the same story. The Salamanca district, historically wealthy, became even more exclusive. The working class neighborhoods of Vallecas and Carabanchel saw their poverty rates climb. The middle class neighborhoods that used to buffer these extremes began to hollow out.

Valencia, the smallest of the three, followed the same trajectory but from a lower starting point. Its segregation levels were lower in 2001 than Madrid's or Barcelona's. By 2021, it had nearly caught up.

What Is Actually Causing This? (Spoiler: It Is Not Gentrification)

Here is where the study gets interesting. Most popular writing about urban inequality focuses on gentrification. The story goes like this: young professionals move into poor neighborhoods, drive up rents, and push out longtime residents. It is a real phenomenon. It happens. But Mazorra Rodríguez's data suggests that gentrification is not the primary driver of segregation in Spanish cities.

The bigger force is something more structural: the transformation of the urban economy itself.

Over the last three decades, Madrid, Barcelona, and Valencia have shifted from industrial and manufacturing bases to service oriented, knowledge based economies. This is the "global city" thesis first articulated by sociologist Saskia Sassen in the 1990s. Global cities attract high end financial services, tech companies, international consulting firms, and tourism. These sectors pay very well for a small number of workers and very poorly for a large number of others.

The result is what Mazorra Rodríguez calls "social polarization." The middle disappears. You get a top tier of highly educated professionals earning six figures, a bottom tier of service workers earning minimum wage or less, and very little in between.

And these two groups do not live in the same neighborhoods.

The wealthy cluster near the city center, where the jobs are and where the amenities have concentrated. The poor move to the periphery, where rent is cheaper but where access to jobs, schools, and public services is worse. This is not gentrification in the classic sense. It is economic restructuring that physically sorts people by class.

Mazorra Rodríguez (2024) writes that the increase in segregation "reflects the trend towards polarized urban models, which reproduce in urban space the differences observed in the social structure." In plain English: the city is becoming a map of inequality. Your address tells strangers your income bracket.

The Education Divide Is the Real Story

Income is one measure. But Mazorra Rodríguez found something even more revealing when he looked at education levels.

The segregation of university educated residents from those with only primary education increased more sharply than income based segregation in all three cities. In Madrid, the dissimilarity index for education rose from 41.1 to 48.9. In Barcelona, from 38.4 to 46.2. In Valencia, from 35.9 to 43.1 (Mazorra Rodríguez, 2024).

Education is the hidden driver. It is not just that rich people live near other rich people. It is that people with degrees live near other people with degrees. And people without degrees live near other people without degrees. This matters because education is the strongest predictor of income, health, and social mobility in modern Spain.

If you grow up in a neighborhood where most adults have university degrees, you are surrounded by networks, information, and expectations that make it easier to get a degree yourself. If you grow up in a neighborhood where most adults did not finish secondary school, you face the opposite.

The education segregation numbers suggest that Spanish cities are building a kind of hereditary class structure into their geography. The children of the educated will inherit not just money but also the social capital that comes from growing up in the right neighborhood. The children of the uneducated will inherit the opposite.

How Global Tourism Accelerates Everything

Tourism is the third force, and it is the one most visible to anyone walking through central Madrid or Barcelona today.

Between 2001 and 2019, international tourist arrivals to Spain nearly doubled, from 50 million to 84 million per year. The cities absorbed a disproportionate share of this growth. Barcelona alone went from 3.4 million overnight visitors in 2001 to 9.5 million in 2019.

Tourism drives segregation through housing markets. Short term rentals like Airbnb push up rents in desirable neighborhoods, pricing out local residents. The displaced move to cheaper areas, increasing the concentration of lower income groups on the periphery. Meanwhile, the tourist economy creates large numbers of low wage service jobs that are filled by migrants and young people who cannot afford to live in the neighborhoods where they work.

Mazorra Rodríguez's data shows that the neighborhoods with the highest density of tourist accommodations in 2021 were also the neighborhoods with the highest concentrations of high income, highly educated residents. The tourist economy and the knowledge economy reinforce each other. They create a geography of winners and losers.

Valencia is the cautionary tale. In 2001, it was the least segregated of the three cities. But Valencia also experienced the fastest growth in tourism over the study period. By 2021, its segregation levels had risen to match Barcelona's of a decade earlier. The city that was late to the global city model is catching up fast.

What the Data Does Not Prove

The study is rigorous, but it has limits. Mazorra Rodríguez uses census data, which captures where people live but not why they moved there. The data cannot tell you whether a given neighborhood became richer because rich people moved in or because the people already there got richer. It is probably a mix of both, and the study does not disentangle them.

The data also stops in 2021. That means it captures the first year of the COVID 19 pandemic, which disrupted migration patterns and housing markets in unpredictable ways. It is possible that the pandemic reversed some of the trends, as remote work allowed people to leave expensive central neighborhoods. It is also possible that it accelerated them, as the wealthy bought up second homes in the countryside while the poor were trapped in overcrowded urban housing. We do not know yet.

The study does not measure race or ethnicity directly. Spain's census does not collect data on race the way the United States census does. This is a significant gap, because much of the segregation literature in other countries focuses on racial segregation. In Spain, the relevant divisions may be between native born Spaniards and immigrants, particularly from Latin America, North Africa, and Eastern Europe. Mazorra Rodríguez notes this limitation and calls for future research that includes migration status.

Finally, the study is about three cities. Spain has dozens of other cities, from Bilbao to Seville to Zaragoza, that may follow different patterns. The global city model applies most strongly to Madrid and Barcelona. Smaller cities with different economic bases may be more equal.

What This Actually Means

The study by Mazorra Rodríguez (2024) is not just an academic exercise. It has real implications for how Spanish cities should be governed. Here is what the findings suggest in practical terms.

• ▸Housing policy must be targeted by neighborhood, not by city. Blanket rent controls or subsidies will not fix segregation if they apply everywhere equally. The problem is concentrated in specific zones. Madrid's Salamanca district does not need more affordable housing in the same way that Vallecas does. The policies need to match the geography of inequality.

• ▸Tourism regulation is segregation policy by another name. Every new short term rental license issued in central Barcelona is a small push toward greater segregation. Cities that want to remain mixed need to cap tourist accommodations in residential neighborhoods, as Barcelona has begun to do. The data shows that doing nothing is not neutral. It is a choice to let the market sort people by class.

• ▸Education spending should follow the segregation map. If university educated families are clustering in certain school districts, those schools will naturally perform better. The children in poorer districts will fall further behind. Spanish cities need to invest disproportionately in schools in segregated low income neighborhoods, not equally across all neighborhoods. Equal funding in an unequal system perpetuates inequality.

• ▸The middle class needs active protection. The study shows that the middle is shrinking. Cities that want to remain socially mixed need policies that keep middle income households in central neighborhoods. This might mean limited equity cooperatives, inclusionary zoning that requires new developments to include units for middle income families, or tax incentives for long term residents.

• ▸Segregation is not inevitable. Valencia in 2001 shows that Spanish cities can be relatively integrated. The trend toward segregation is a product of specific economic and policy choices. Those choices can be reversed. But it requires recognizing that the global city model, left to itself, produces a segregated city. The question is whether Spanish voters and politicians want that outcome.

The Barcelona you remember from twenty years ago is not coming back. But the Barcelona of twenty years from now has not been written yet. The data is clear about where things are heading. The only question is whether anyone will steer.