城市规模、空间距离与城市经济吸引区——一个简单的经济地理模型

City Size, Spatial Distance, and City′s Economic Gravitation Region: A Simple Economic Geographical Model

本文从经济运行的微观基础出发,构建了一个简单的经济地理模型,并以此为基础对城市经济吸引区的相关问题进行了初步的探讨,解释了由“引力法则”和断裂点理论推导出的两个经验性推论:一是两个相邻且规模相等的城市其经济吸引区分界线为二者连线的中垂线;二是对于两个相邻但规模不相等的城市,则小城市的经济吸引区可能处于大城市吸引区的包围(或部分包围)之中。

In this article, we design a simple Economic Geographical model based on the micro- economic foundation. Then, we use the model to analyze the problems about city＇s economic gravitation region. The analysis gives us the principle to explain the conclusions that are inferred from the Law of Gravitation and Breaking - point Theory ： there are two adjacent cities, if they have the same size, their economic gravitation regions＇ breaking line will be the perpendicular bisector of the two cities＇ linking line; but if they have different sizes, the small city＇s economic gravitation region may be wholly or partially surrounded by the big city＇s economic gravitation region.