农民工代际收入流动性与传递路径贡献率分解研究

A Study on Mobility of Intergenerational Income among Migrant Workers and It's Transmission Channels Decomposition

考察农民工代际收入流动性以及父代是否外出务工对代际收入流动性的影响,发现父代未外出务工与子代农民工之间的代际收入流动性高于父代外出务工的两代农民工家庭。进一步使用Eriksson"条件收入弹性"中间变量法,从人力资本、社会资本、职业代际传递三条路径对代际收入流动系数进行分解并考察各路径的贡献率,结果发现:对父代未外出务工样本,人力资本是代际收入传递的直接路径,社会资本是间接路径;对父代外出务工样本,代际职业传递和社会资本传递加强了代际间收入传递,其中代际职业传递路径的贡献率最高。最后,利用倾向匹配法(ATT)处理了社会资本的内生性偏差,通过了严格的稳健性检验,表明社会资本水平较高的农民工收入高于社会资本水平较低的农民工。

This study was aimed to investigate the intergenerational income mobility of migrant workers and the effects on the intergenerational income mobility whether parents worked outside as migrant workers or not. The results showed that the intergenerational income mobility between child-migrant workers and their non-migrant working parents was higher than that between child- migrant workers and their migrant working parents. We further used Eriksson＇ s Conditional Income Elasticity as an intermediate variable method to decompose the intergenerational income mobility coefficient through three channels： the human capital, the social capital and the occupational intergenerational transmission. We found that in the non-migrant working parent group, the human capital was a direct channel for the intergenerational income transmission, while the social capital was an indirect channel. In the migrant working parent group, both the occupational intergenerational transmission and the social capital transmission enhanced the intergenerational income transmission, whereas the former channel contributed a much higher rate. Last, we used the propensity score matching method （PSM） to attenuate the endogenous bias of the social capital with a rigorous robust test and the result showed that the higher the social capital of migrant workers was, the more income the migrant workers earned.