Instability in Rural-Urban Migration
用哈里斯-托达罗-刘易斯模型分析城乡迁移的稳定性，发现反向迁移可能导致劳动力市场调整不稳定，甚至出现混沌波动，并探讨了调整速度、工农业生产率等因素的影响。
Newly observed instances of reverse migration, i.e., migration from urban to rural areas, suggest the possibility that the labor market adjustment process could be unstable. We provide a theoretical analysis of this conjecture using a Harris-Todaro-Lewis model. A bifurcation analysis is presented that shows how various stable and unstable adjustments are possible including chaotic fluctuations and how these possibilities are related to adjustment speed, the productivity of industry and agriculture, and the relative importance of industry and population size. Examples of unstable adjustments in a hypothetical LDC and DC are given using "plausible" parameter values.