Biographical note: BarroRobert: Robert J. Barro is Professor of Economics, Harvard University, and has written widely on macroeconomic and monetary economics. He is the author of Macroeconomics and the editor of Modern Business Cycle Theory.

The Hotelling locational model and its adaptations to a circular city provide a core framework for research in industrial organization. The present paper expands the explanatory power of this model by incorporating a continuum of consumers with constant-elasticity demand functions along with...