Study Estimates Zoning Reform in São Paulo Produced Welfare Gains of 0.65% of City GDP
Key Takeaways
- •The zoning reform in São Paulo raised maximum permitted construction levels along designated transportation corridors, prompting developers to increase multifamily construction filings in directly affected blocks.
- •The researchers' equilibrium model estimates that the reform produced a 1.6% increase in the city's overall housing stock and a 0.4% reduction in housing prices.
- •Welfare gains from the reform were equivalent to 0.65% of São Paulo's city GDP, driven mainly by developer profits and consumer benefits from newly built housing.
- •The upzoning policy resulted in substantial wealth transfers from existing property owners to future homeowners as property values moderated in affected neighborhoods.
- •The study adds to a growing body of economic research on transit-oriented development, alongside comparable reforms in cities such as Auckland that economists are examining for their effects on housing supply and affordability.
A study published in the AEA policy journal examines the economic effects of zoning reform in São Paulo, Brazil, which raised the maximum permitted construction levels along designated transportation corridors. The research, conducted by Santosh Anagol, Fernando Ferreira, and Jonah Rexer, uses an equilibrium model of housing markets to quantify the outcomes. São Paulo is one of the largest metropolitan areas in the world, home to over 12 million residents in the city proper, making the scale of measured effects particularly relevant for other fast-growing cities considering similar upzoning policies.
According to the findings, developers responded to the relaxed restrictions by increasing filings for multifamily construction in the blocks directly affected by the reform. This added supply contributed to lower housing prices in neighborhoods where greater densification was permitted. The model estimates an aggregate 1.6 percent increase in the city's housing stock and a 0.4 percent reduction in housing prices.
The researchers note that these shifts resulted in large housing wealth transfers from current homeowners to future homeowners, as property values moderated in the affected areas. This distributional dimension is a recurring theme in urban economics: relaxing building restrictions tends to benefit prospective residents and developers while reducing the asset values of existing property owners, creating political tension around reform efforts. Overall, the reform produced welfare gains equivalent to 0.65 percent of São Paulo's city GDP. These gains were attributed primarily to developer profits and consumer benefits from the newly built environment.
The study contributes to a broader body of economic research on how land-use regulations shape urban housing markets. Zoning reforms that permit higher-density construction near transit infrastructure—a strategy often described as transit-oriented development—are frequently studied for their potential to expand housing affordability and improve urban welfare, though outcomes vary significantly across cities and policy designs. Comparable reforms in cities such as Auckland, New Zealand, have drawn attention from economists examining whether permitting more multifamily housing translates into measurable increases in supply and moderation of prices.
Source: Marginal Revolution, referencing the AEA policy journal.
