摘要：The continuously expanding urban–rural income gap is an indisputable fact during the rapid economic development in China. Accordingly, narrowing the urban–rural income gap is an important topic and considerable concern in the academic circles and practical fi eld. To explore the causes of the urban–rural income gap, the infl uential eff ects of social security expenditure, demographic structural changes, and urban–rural income gap were analyzed using the fi xed eff ect model of the cluster-robust standard errors and the provincial data of 341 samples which covered 31 provincial areas in Mainland China from 2006 to 2016. Results demonstrate that the growth of social security expenditure narrows the urban–rural income gap, and such eff ect has evident regional diff erences. The growth of social security expenditure in Western China further expands the urban–rural income gap owing to the urban bias of fi scal expenditure. In addition, the population aging expands the urban–rural income gap. The urbanization level has signifi cantly negative eff ect in regulating the relationship between demographic structure and urban–rural income gap. In regions with low urbanization level, the population aging decreases the total social demands and increases the unemployment rate in rural areas, thereby further expanding the urban–rural income gap. The urban bias of social security expenditure further intensifi es the urban–rural income gap. On the contrary, regions with high urbanization level have weak dual economic structure that weakens the positive impact of population aging on the urban–rural income gap. The obtained conclusions provide decision-making references for formulating social security and population intervention policy.
关键词：income gap; social security expenditure; demographic structure; aging.
