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IT and Urban Polarization

By Jan Eeckhout, Christoph Hedtrich, and Roberto Pinheiro

American Economic Journal: Macroeconomics, January 2026

We show that differential IT investment across cities has been a key driver of job and wage polarization since the 1990s. Using a novel dataset, we establish two stylized facts: IT investment is highest in firms in large and expensive cities, and the decl...

Immigration, Innovation, and Growth

By Stephen J. Terry Thomas Chaney Konrad B. Burchardi Lisa Tarquinio Tarek A. Hassan

American Economic Review, March 2026

We propose a novel identification strategy to isolate exogenous immigration shocks across US counties, by interacting quasi-random variations in the composition of ancestry across counties with the contemporaneous inflow of migrants from different countri...