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Home | Events Archive | Non-Random Exposure: Theory and Applications

Non-Random Exposure: Theory and Applications

  • Series
    Research on Monday
  • Speaker(s)
    Kirill Borusyak (University College London, United Kingdom)
  • Location
    Erasmus University Rotterdam, Campus Woudestein, Van der Goot Building M3-03
  • Date and time

    March 28, 2022
    11:30 - 12:30

Abstract: We develop new tools for estimating the causal effects of treatments or instruments that combine multiple sources of variation according to a known formula. Examples include treatments capturing spillovers in social and transportation networks, simulated instruments for policy eligibility, and shift-share instruments. We show how exogenous shocks to some, but not all, determinants of such variables can be leveraged while avoiding omitted variables bias. Our solution involves specifying counterfactual shocks that may as well have been realized and adjusting for a summary measure of non-randomness in shock exposure: the average treatment (or instrument) across such counterfactuals. We further show how to use shock counterfactuals for valid finite-sample inference, and characterize the valid instruments that are asymptotically efficient. We apply this framework to address bias when estimating employment effects of market access growth from Chinese high-speed rail construction, and to boost power when estimating coverage effects of expanded Medicaid eligibility.

Please send host Agnieszka Markiewicz an email if you would like to have a bilateral, join lunch or dinner with Kirill.