NATIONAL BUREAU OF ECONOMIC RESEARCH
NATIONAL BUREAU OF ECONOMIC RESEARCH
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Kirill Borusyak

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Institutional Affiliation: University College London

NBER Working Papers and Publications

September 2018Quasi-Experimental Shift-Share Research Designs
with Peter Hull, Xavier Jaravel: w24997
Many studies use shift-share (or “Bartik”) instruments, which average a set of shocks with exposure share weights. We provide a new econometric framework for such designs in which identification follows from the quasi-random assignment of shocks, allowing exposure shares to be endogenous. This framework is centered around a numerical equivalence: conventional shift-share instrumental variable (SSIV) regression coefficients are equivalently obtained from a transformed regression where the shocks are used directly as an instrument. This equivalence implies a shock-level translation of the SSIV exclusion restriction, which holds when shocks are as-good-as-randomly assigned and large in number, with sufficient dispersion in their average exposure. We discuss and illustrate several practical in...
 
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