David Welsch, 01 December 2020

The science behind mask usage and its ability to reduce airborne particles seems clear. Despite this, many individuals are sceptical that wearing masks can reduce the spread of COVID-19 and many refuse to wear one even when required. This column examines the effect of mask usage using county-level data from the US, employing an instrumental variable approach. The findings show that increasing the amount of individuals who frequently or always wear a mask when within six feet of people by 1% could reduce COVID-19 deaths by 10.5%, which translates into approximately six deaths in the average county. 

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