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Uncertainty Shocks, Adjustment Costs, and Firm Beliefs: Evidence from a Representative Survey

By Andreas Dibiasi, Heiner Mikosch, and Samad Sarferaz

American Economic Journal: Macroeconomics, July 2025

This paper studies the dynamic effects of an uncertainty shock on firm expectations. We conduct a survey that confronts managers from a representative firm sample with a model-consistent uncertainty shock scenario. An exogenous increase in uncertainty sig...

The Impact of Unemployment Benefit Extensions on Employment: The 2014 Employment Miracle?

By Marcus Hagedorn, Iourii Manovskii, and Kurt Mitman

American Economic Journal: Macroeconomics, October 2025

We measure the aggregate effect of unemployment benefit duration on employment and the labor force. We exploit the variation induced by Congress's failure in December 2013 to reauthorize the unprecedented benefit extensions introduced during the Great Rec...

Stages of Diversification

By Jean Imbs and Romain Wacziarg

American Economic Review, March 2003

This paper studies the evolution of sectoral concentration in relation to the level of per capita income. We show that various measures of sectoral concentration follow a U-shaped pattern across a wide variety of data sources: countries first diversify, i...

Labor Market Power: From Micro Evidence to Macro Consequences

[Symposium: Competition in Labor Markets]

By David Berger, Kyle Herkenhoff, and Simon Mongey

Journal of Economic Perspectives, Winter 2026

The traditional theoretical and empirical "micro approach" to studying labor market power (or monopsony) requires that firms are small and atomistic. This is at odds with the reality of labor markets in which monopsony potentially matters most. Empiricall...