Mike Munger of Duke University talks with EconTalk host Russ Roberts about why milk is in the back of the grocery store. Michael Pollan and others argue that milk is in the back so that customers, who often buy milk, will be forced to walk through the entire story and be encouraged by the trek to buy other items. Munger and Roberts argue that competition encourages stores to serve customers and that alternative explanations explain where milk is found in the store. The conversation also discusses restaurant pricing, government "nudging" and related issues of grocery economics.