"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 review how deregulation, technological advance, and increased competitive rivalry have affected the size and health of the U.S. community banking sector and the quality and availability of banking products and services. We then develop a simple theoretical framework for analyzing how these...