Bob Chaldini put up signs in a national park to discourage people from stealing petrified wood. The sign tripled the rate of theft, according to an experiment he did with his graduate student. We want to hear your sign stories. Send them to us at n s c at freconomics dot com.
Do highway warnings save lives or cost lives? How do you keep men from peeing on the floor? And what’s Angela’s plan to get more people washing their hands?