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New Variations for Strategy Set-shifting in the Rat
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Quasi-Experimental Shift-Share Research Designs.

Kirill Borusyak1, Peter Hull2, Xavier Jaravel3

  • 1UCL and CEPR.

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|June 26, 2023
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This summary is machine-generated.

This study introduces a new econometric framework for shift-share instrumental variable (SSIV) regressions. The approach allows for endogenous exposure shares, improving analysis of economic shocks like import competition on employment.

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Area of Science:

  • Econometrics
  • Labor Economics
  • Regional Economics

Background:

  • Shift-share (or Bartik) instruments are widely used in empirical studies.
  • These instruments average shocks using exposure share weights.
  • The endogeneity of exposure shares can be a limitation.

Purpose of the Study:

  • To develop a novel econometric framework for shift-share instrumental variable (SSIV) regressions.
  • To allow for endogenous exposure shares while maintaining identification through quasi-random shock assignment.
  • To provide a new perspective on the consistency conditions for SSIV coefficients.

Main Methods:

  • Developed a new econometric framework for SSIV regressions.
  • Utilized an equivalence result linking instrument-residual orthogonality to shock-level unobservables.
  • Derived shock-level conditions for the consistency of SSIV coefficients.
  • Applied the framework to estimate the impact of Chinese import competition on U.S. manufacturing employment.

Main Results:

  • The proposed framework allows for endogenous exposure shares.
  • Identification is achieved through the quasi-random assignment of underlying shocks.
  • The equivalence result simplifies the understanding of SSIV identification.
  • Consistent estimation of the effects of economic shocks is facilitated.

Conclusions:

  • The new SSIV framework offers a more flexible and robust approach to analyzing economic shocks.
  • It addresses the potential endogeneity of exposure shares, a common concern.
  • The findings have practical implications for estimating the impact of trade and other shocks on labor markets.