Gabriel Ahlfeldt, Stephen Redding, Daniel Sturm, Nikolaus Wolf, 20 August 2014

Economic activity is highly unevenly distributed across space. Understanding what drives the agglomeration and dispersion is important for many economic and policy questions. This column describes a theoretical model of internal city structure incorporating agglomeration and dispersion and heterogeneity in local fundamentals. The authors use the division and reunification of Berlin as a natural experiment. Their findings show that both heterogeneity in locational fundamentals and agglomeration forces are important in shaping a city’s internal structure.

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