My friend Bob Litan, who is a senior fellow at the Brookings Institution, is worried about COVID-19 herd immunity. Specifically, Bob worries that the only way our population can reach the 60-70 percent immunity rate required to protect us all from the novel coronavirus is if some people are paid to take the shot. And Bob may be correct: a Gallup poll last month concluded that 35 percent of Americans would refuse to be vaccinated.

Uh-oh.

Bob thinks the way around this problem is to pay people, giving them an economic incentive to do the right thing. This got me thinking about the whole concept of […]