“How much do the Tampa Bay Rays boost their local economy?” asks the Tampa Bay Times. In arguments for building a new stadium, St. Petersburg mayor Bill Foster estimates the team’s local economic impact at $100 million a year, but experts, including UMBC economics professor Dennis Coates, question the assumption that stadiums have a notable economic benefit to their home cities. Coates explains that when a couple spends $100 for dinner and a movie, much of that money goes to waiters, ticket takers and other local workers and suppliers, who in turn spend their paychecks on rent and food, creating …