"This paper empirically examines the effects of market size on producers' sizes in retail trade industries with many producers. A robust prediction of oligopoly theory is that larger markets are more competitive and have lower price-cost markups. Because producers in more competitive markets...

"We calibrate a model of labor demand to infer the employment responseto a change in the minimum wage in the food away from home industry. Assuming a perfectly competi- tive labor market, the model predicts a 2.5 to 3.5 percent fall in employment in response to a 10 percent minimum wage change....