A TRACTABLE CITY MODEL FOR AGGREGATIVE ANALYSIS
提出了一个具有外部规模报酬递增的可解析城市模型，均衡结构可为单中心或多中心，内生变量从市中心呈指数衰减，并分析了中央商务区出现条件、租金梯度、工资和福利随人口的变化，以及城市增长边界的影响。
An analytically tractable city model with external increasing returns is presented. The equilibrium city structure is either monocentric or decentralized. Regardless of which structure prevails, intracity variation in endogenous variables displays exponential decay from the city center, where the decay rates depend only on parameters. Given population, the equilibrium of the model is generically unique. Tractability permits explicit expressions for when a central business district (CBD) will emerge in equilibrium, how external increasing returns affect the steepness of downtown rent gradients, and how wages and welfare vary with population. An application to urban growth boundary is presented.