Public health officials should tell the truth, even when it's complicated. Even when some people might misunderstand. Otherwise, says economist Emily Oster of Brown University, the public will come to distrust the people we need to trust if we are to make good decisions both personally and publicly. Listen as Oster talks with EconTalk host Russ Roberts about vaccines, fluoride, raw milk, and the lessons learned and yet-to-be learned from the Covid pandemic.