When is the economy monocentric?: von Thünen and Chamberlin unified
建立了一个垄断竞争模型，研究冯·杜能模型中为何所有制造业集中在单一城镇，并探讨何时会出现多个城镇，旨在为城市系统的一般均衡模型奠定基础。
Since The Isolated State by von Thünen, countless versions of the von Thünen model have appeared. It seems, however, that a fundamental question remains unanswered: Why should all manufacturing goods be produced in a single town? In this paper we develop a monopolistic competition model of an ‘isolated state’, and investigate the answer to this question. Since the answer to this question suggests when there will be more than one town in the isolated state, it is hoped the present model will lead to the development of a general equilibrium model of urban systems.