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History and the Sizes of Cities

By Hoyt Bleakley and Jeffrey Lin

American Economic Review, May 2015

We contrast evidence of urban path dependence with efforts to analyze calibrated models of city sizes. Recent evidence of persistent city sizes following the obsolescence of historical advantages suggests that path dependence cannot be understood as the m...

Detecting Learning by Exporting

By Jan De Loecker

American Economic Journal: Microeconomics, August 2013

Learning by exporting refers to the mechanism whereby a firm's performance improves after entering export markets. This mechanism is often mentioned in policy documents, but many econometric studies have not found corroborating evidence. I show that th...

A Dual-Self Model of Impulse Control

By Drew Fudenberg and David K. Levine

American Economic Review, December 2006

We propose that a simple “dual-self” model gives a unified explanation for several empirical regularities, including the apparent time inconsistency that has motivated models of quasi-hyperbolic discounting and Rabin’s paradox of risk aversion in the...