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Causal impact of masks, policies, behavior on early COVID-19 pandemic in the U.S

Author

Listed:
  • Victor Chernozhukov

    (Institute for Fiscal Studies and MIT)

  • Hiroyuki Kasahara

    (Institute for Fiscal Studies and University of British Columbia)

  • Paul Schrimpf

    (Institute for Fiscal Studies and The University of British Columbia)

Abstract
This paper evaluates the dynamic impact of various policies, such as school, business, and restaurant closures, adopted by the US states on the growth rates of con?rmed Covid-19 cases and social distancing behavior measured by Google Mobility Reports, where we take into consideration of people’s voluntarily behavioral response to new information of transmission risks. Using the US state-level data, our analysis ?nds that both policies and information on transmission risks are important determinants of people’s social distancing behavior, and shows that a change in policies explains a large fraction of observed changes in social distancing behavior. Our counterfactual experiments indicate that removing all policies on April 1st of 2020 would have lead to 30 to 200 times more additional cases by late May. Removing only the non-essential businesses closures (while maintaining restrictions on movie theaters and restaurants) would have increased the weekly growth rate of cases between -0.02 and 0.06 and would have lead to -10% to 40% more cases by late May. Finally, nationally mandating face masks for employees on April 1st would have reduced the case growth rate by 0.1-0.25. This leads to 30% to 57% fewer reported cases by late May, which translates into, roughly, 30-57 thousand saved lives. This output was updated on 06/07/2020.

Suggested Citation

  • Victor Chernozhukov & Hiroyuki Kasahara & Paul Schrimpf, 2020. "Causal impact of masks, policies, behavior on early COVID-19 pandemic in the U.S," CeMMAP working papers CWP24/20, Centre for Microdata Methods and Practice, Institute for Fiscal Studies.
    • Handle: RePEc:ifs:cemmap:24/20
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    File URL: https://www.ifs.org.uk/uploads/CWP2420-Causal-impact-of-masks-update.pdf
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