We present evidence that Earvin “Magic” Johnson’s announcement that he contracted HIV served as a public-health catalyst for rapidly correcting the public’s understanding of who was at risk of infection. Using a novel identification strategy, we present evidence that there was a large...

The COVID-19 pandemic shut down sporting events worldwide. Local policy makers and league officials face important decisions about restarting play, especially in professional leagues that draw large numbers of spectators to games. We analyze the impact of professional sporting events on local...