The Macroeconomic Impact of Microeconomic Shocks: Beyond Hulten's Theorem

David Rezza Baqaee; Emmanuel Farhi

doi:10.3982/ecta15202

journal article Jan 01, 2019

The Macroeconomic Impact of Microeconomic Shocks: Beyond Hulten's Theorem

David Rezza Baqaee Emmanuel Farhi

Econometrica Vol. 87 No. 4 pp. 1155-1203 · JSTOR

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Abstract

We provide a nonlinear characterization of the macroeconomic impact of microeconomic productivity shocks in terms of reduced‐form nonparametric elasticities for efficient economies. We also show how microeconomic parameters are mapped to these reduced‐form general equilibrium elasticities. In this sense, we extend the foundational theorem of Hulten (1978) beyond the first order to capture nonlinearities. Key features ignored by first‐order approximations that play a crucial role are: structural microeconomic elasticities of substitution, network linkages, structural microeconomic returns to scale, and the extent of factor reallocation. In a business‐cycle calibration with sectoral shocks, nonlinearities magnify negative shocks and attenuate positive shocks, resulting in an aggregate output distribution that is asymmetric (negative skewness), fat‐tailed (excess kurtosis), and has a negative mean, even when shocks are symmetric and thin‐tailed. Average output losses due to short‐run sectoral shocks are an order of magnitude larger than the welfare cost of business cycles calculated by Lucas (1987). Nonlinearities can also cause shocks to critical sectors to have disproportionate macroeconomic effects, almost tripling the estimated impact of the 1970s oil shocks on world aggregate output. Finally, in a long‐run growth context, nonlinearities, which underpin Baumol's cost disease via the increase over time in the sales shares of low‐growth bottleneck sectors, account for a 20 percentage point reduction in aggregate TFP growth over the period 1948–2014 in the United States.

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References

Details

Published: Jan 01, 2019
Vol/Issue: 87(4)
Pages: 1155-1203

Authors

D

David Rezza Baqaee

Department of Economics, UCLA

E

Emmanuel Farhi

Department of Economics, Harvard University

Cite This Article

David Rezza Baqaee, Emmanuel Farhi (2019). The Macroeconomic Impact of Microeconomic Shocks: Beyond Hulten's Theorem. Econometrica, 87(4), 1155-1203. https://doi.org/10.3982/ecta15202

The Macroeconomic Impact of Microeconomic Shocks: Beyond Hulten's Theorem

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