Burns and Mitchell (1946, 109) found a recession of “exceptional brevity and moderate amplitude.” I confirm their judgment by examining a variety of high-frequency, aggregate and cross-sectional data. Industrial output fell sharply but rebounded within months. Retail seemed little affected...

I jointly use daily data on deaths and public transportation ridership in San Francisco in 1918–19 to estimate a model in which agents choose their level of economic activity based on perceived infection risk, modeled as a function of current and lagged infections or deaths. Agents’ choices...