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The Impact of Mask Usage on COVID-19 Deaths: Evidence from US Counties Using a Quasi-Experimental Approach

Author

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  • Welsch David

    (Economics, University of Wisconsin - Whitewater, 800 S. Main St., 53190, Whitewater, WI, USA)

Abstract
I examine the relationship between mask usage and COVID-19 deaths at the county level. When examining this relationship, even the direction caused by the potential endogeneity bias is unclear. In one direction, characteristics that are known to correlate with a larger amount of potential COVID-19 deaths, such as an older population, may make people more likely to wear masks. This will cause a bias that makes mask usage look less effective than it truly is. In the other direction, areas with higher risk tolerances may have less mask usage, but may at the same time be engaging in other behavior that puts them at higher risk for contracting COVID-19. This will cause a bias that makes mask usage look more effective than it truly is. The identification approach exploits a large set of controls and employs percentage of vote for Donald Trump in the 2016 election as an instrumental variable for mask usage. The main finding is that a one percentage point increase in the number of individuals who say they often or frequently wear a mask when within six feet of people will reduce COVID-19 deaths in a county by 10.5%, or six deaths in the average county.

Suggested Citation

  • Welsch David, 2022. "The Impact of Mask Usage on COVID-19 Deaths: Evidence from US Counties Using a Quasi-Experimental Approach," The B.E. Journal of Economic Analysis & Policy, De Gruyter, vol. 22(1), pages 1-28, January.
    • Handle: RePEc:bpj:bejeap:v:22:y:2022:i:1:p:1-28:n:3
    DOI: 10.1515/bejeap-2021-0157
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    Cited by:

    1. Kit Baum & Andrés Garcia-Suaza & Miguel Henry & Jesús Otero, "undated". "Drivers of COVID-19 deaths in the United States: A two-stage modeling approach," Northern European Stata Conference 2023 01, Stata Users Group.

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