Fifty years ago, many of the best players in the National Football League took jobs in the off-season to augment the salaries they earned playing football. Matthew Futterman of the Wall Street Journal and author of Players talks with EconTalk host Russ Roberts about how much football and so many aspects of sports--from tennis to golf to apparel to broadcasting to Olympics--has become incredibly more lucrative. Futterman shares the insights from his book and how all that money has changed sports, the athletes who compete, and the fans who watch.