“It’s probably sensible most of the time to believe if the government says now is the time to open up, it might be safe,” says Robert H. Frank, the author of Under the Influence, a book about peer pressure, and a management professor at Cornell University.

And peer pressure, he says, isn’t always a bad thing. Taking cues from those around you has cognitive advantages. “It’s a complicated world out there,” he told me. “Each one of us knows only a tiny fraction of what would be good to know. You don’t know much; I don’t know much. But together, people actually know quite a bit about the world.”