COVID-19 shifted schools and colleges to online instruction with little causal evidence of outcomes. In the fall of 2020, we randomized 551 West Point students in a required Introductory Economics course across twelve instructors to either an online or in-person class. Final grades for online...

In a world crisis generated by the spread of Covid-19, beyond the negative consequences, fast and efficient responses were needed from the authorities across the world, both for the scenario in which the crisis was on a short period and education would have recovered quickly, and especially for...