A Spatial Knowledge Economy
构建了首个以思想交换为集聚力的城市体系模型，解释了为何大城市技能溢价更高，以及对称基础如何产生溢价差异。
Leading empiricists and theorists of cities have recently argued that the generation and exchange of ideas must play a more central role in the analysis of cities. This paper develops the first system of cities model with costly idea exchange as the agglomeration force. The model replicates a broad set of established facts about the cross section of cities. It provides the first spatial equilibrium theory of why skill premia are higher in larger cities and how variation in these premia emerges from symmetric fundamentals.