西部大开发战略对城乡收入差距的影响评估——基于双重差分模型的实证研究

An Evaluation of the Impact of Western Development Strategy on Urban-rural Income Gap:An Empirical Study Based on Difference in Differences Model

为了克服样本选择偏误所导致的内生性问题,采用双重差分模型评估西部大开发战略迄今的实施对西部地区城乡收入差距的影响。实证结果表明,与东部及中部各省相比,西部大开发战略使西部各省城乡收入差距的水平值相对于样本均值增加了5.7-8.5个百分点;西部大开发战略显著拉大了西部地区城乡收入差距水平。在使用不同处理方法进行稳健性检验后,上述结论仍然成立。

In order to overcome the endogenous problem caused by the sample selection bias,this article uses the difference in difference method and tests the effect of China＇s western development on urban-rural gap in western area.The empirical results show,compared with eastern and central provinces,the western development strategy increased the level value of urban-rural income gap by 6.3-8.5percentage points relative to the sample average in western provinces;the western development strategy significantly widened the urban-rural income gap in the west of China.The conclusion above remains valid after being tested in different processing methods for robustness.