经济中心城市的集聚与扩散规律研究

经济中心城市具有集聚和扩散这两种基本运动形式。它们遵循着三条基本规律，即经济中心城市的集聚和扩散力随着其综合实力的提高而增强（增强律），随着运输费用的提高而衰减（衰减律），并趋向生产力布局的优区位（指向律），根据这三条基本规律，城市的引力公式应修改为：两城市之间的引力与城市的质量成正比，与运输费用的平方成反比。

The Research of Centralization and Diffusion Laws to the Economic Central City

The two basic movement patterns of an Economic Central City (E.C.C) are centralization and diffusion.They follow the three basic laws:the powers of centralization and diffusion of the Economic Central City will strengthen with the increase of its compositive strength (Strengthening Law),decline with the increase of transportation cost (Weakening Law) and incline to advantageous position of productivity distribution (Direction Law).On the basis of these three basic laws,the formula for measuring the gravitation between cities should be revised as follows:the gravitation between two cities is in direct ratio to their quality and in inverse ratio to the square of their transportation costs.