基于民工异质的刘易斯模型改造

刘易斯模型能够很好地解释我国长期低工资水平下的“民工潮”现象,但因其剩余劳动力完全同质的假设而无法解释我国当前发生的“民工荒”现象。本文依据“保留工资”高低将民工分成若干个类别,从而构建了一个基于民工异质的民工市场模型：经此改造的刘易斯模型分析的意义在于,它提供了一个能够同时解释“民工潮”与“民工荒”的统一的理论框架,揭示了“民工潮”与“民工荒”有可能交替发生,显示了破解当前“民工荒”问题的根本之策是提高民工工资,表明了“刘易斯拐点”在我国还远未出现：

The Revision of Lewis's Model According to the Heterogeneity of Peasant Workers

Lewis”s model can make well an analysis of“the rush flow of peasant workers” against a low level of wage rate for a decade,but it can't explain“the shortage of farmer-turned workers” which occurs currently in China because of the assumption of the completely homogeneity of redundant labor. This paper classifies peasant workers in the light of reservation wage,thereby develops a model of the market for peasant workers according to the heterogeneity of peasant workers. The Revised Lewis's model provides an unitary analytical framework which can explain both“the rush flow of peasant workers”and“the Shortage of farmer-turned workers”,discloses that “the rush flow of peasant workers” and “the Shortage of farmer-turned workers” maybe occur in turn,demonstrates that increasing the wage of peasant workers is the thoroughly method of solving the problem of “the Shortage of farmer-turned workers”,indicates that “Lewis’s turning point” will appear distantly.