2021-08-05-IMF-Mask_Mandates_Save_Lives_50页_6mb

报告摘要

Mask mandates significantly reduced COVID-19 transmission and related outcomes.
Effect on COVID-19 cases: -55 per 100,000 inhabitants.
Effect on hospital admissions: -11 per 100,000 inhabitants.
Effect on deaths: -0.7 per 100,000 inhabitants.
Effects depend on county attitudes toward mask wearing; larger reductions in areas with stronger support for mask use.
Saved approximately 87,000 lives up to December 19, 2020.
A nationwide mandate could have saved an additional 58,000 lives in the same period.
Results imply mask mandates are crucial tools for pandemics, especially with limited vaccine access.

Used regression discontinuity design exploiting county-level variation across state borders where mask mandates differ.
Controlled for other policies and county-level factors to mitigate bias.
Analyzed U.S. county data from January 2020 to December 2020.

Mask mandates remain relevant for countering pandemics due to uneven vaccine rollout and potential future variants.
Conditional effects highlight the importance of public acceptance for effective implementation.

JEL Classification: I18, I12
Keywords: COVID-19, public health measures, face masks, regression discontinuity.

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