In the end, it is further developed of the inverse U hypothesis from monocycle condition to multi-cycle condition with a new hypothesis, which is called cyclical fluctuation of regional disparity.

• 在新古典经济学得出的增长轨迹基础上，利用简化的两地区逻辑曲线初步证明“倒U假说”的成立；并进一步讨论这一假说在多周期情形下的一个拓展，即地区差距的周期波动。