"Neoclassical economic theory predicts that policies that discourage the consumption of a particular good will induce innovation in a socially desirable substitute. Evolutionary theory emphasizes the possibility of innovation waves associated with the identification of new dominant designs. We...

We link the county-level rollout of stay-at-home orders to anonymized cellphone records and consumer spending data. We document three patterns. First, stay-at-home orders caused people to stay at home: county-level measures of mobility declined by between 9% and 13% by the day after the...