进城时长、示范效应与乡城移民家庭消费结构

本文利用2007年家庭收入项目调查数据（CHIP2007）考察在人口城镇化进程中进城务工家庭消费结构是否以及如何随进城时间长短而变化。结果发现：在控制其他影响因素的情况下，乡城移民家庭消费结构与进城时长之间存在非线性关系，进城时间越长，家庭消费结构层级越高，但边际影响是递减的；此外，家庭收入是影响乡城移民家庭消费结构的主要因素；户主的性别、婚姻状况和工作所在行业种类将显著影响乡城移民家庭的消费结构。分位数回归法估计结果表明家庭消费结构与进城时长之间的非线性关系是稳健的。

Time Length of Migrating into City,Demonstration Effect and Consumption Structure of Rural - Urban Migrant Households

Based on the CHIP2007, we study the factors that would influence the consumption structure of rural - urban migrant households under the background of urbanization. The results using OLS estimation shows that ： there exists nonlinear relationship between the consumption structure and the length of time migrating into cities. The longer the time migrating into cities, the higher the level of household consumption structure, but the marginal effect decreases. Household income is the main factor affecting the consumption structure. In addition, gender of the head of household, marital status and the type of trade will significantly affect the consumption structure. The results using quantile regression estimation shows that： at different quantile points, the effects of the length of time migrating into cities on the consumption structure are hardly different. But the effects of household income on the consumption structure are quite different.