关键词: 产业结构升级, 城镇化, 城乡收入差距, 门槛效应

Abstract: Based on the previous research results, this paper links the industrial structure upgrading,urbanization process and the urban-rural income gap, and tentatively finds that the industrial structure upgrading has a nonlinear impact on the urban-rural income gap. Then, using the provincial panel data of China from 2005 to 2018 and taking the urbanization rate as the threshold variable, this paper conducts an empirical test.The results show that there is an obvious nonlinear relationship between industrial structure upgrading and urban-rural income gap. The former has a significant double threshold effect on the latter. When urbanization is in the primary stage, the rationalization and optimization of industrial structure widens urban-rural income gap.When urbanization goes beyond the first threshold and enters the intermediate stage, the impact of industrial structure rationalization is not significant, while the optimization of industrial structure is still significantly expanding the urban-rural income gap. When urbanization crosses the second threshold and enters the advanced stage, the rationalization and optimization of industrial structure both significantly narrow the urban-rural income gap. By eliminating the extreme values in the sample and replacing the surrogate variables of the explained variables and core explanatory variables, the robustness test shows the above conclusion still holds. In addition,from a regional perspective, the industrial structure upgrading in eastern, northeast and western regions of China also has a significant double threshold effect on urban-rural income gap, but the performance of different regions is not the same. The threshold effect of eastern and northeast regions on urban-rural income gap is inverted Ushaped;the western is still on the left side of the inverted U-shaped curve. In the central region, there is only the single threshold effect with urbanization rate as the threshold variable. This paper analyzes the reasons and gives the policy implications.

Key words: Industrial Structure Upgrading, Urbanization, Urban-Rural Income Gap, Threshold Effect