关键词: 劳动搜寻匹配, 劳动所得税, 资本所得税, 劳动份额, 福利成本

Abstract: This article introduces labor market friction into the standard business cycle theoretical framework, constructs a dynamic general equilibrium model that takes into account the labor search behavior, analyzes the economic dynamic effects of two adjustment policies, the labor income tax and the capital income tax, and estimates the welfare costs of tax policies. The research results show that separate changes in the labor income tax and the capital income tax have opposite effects on labor income share and income inequality, and both will lead to the expansion of the gap between labor productivity and wages. At the same time, the implementation of proactive fiscal policies that reduce taxes and increase government spending can promote employment, increase the labor income share, and reduce income inequality. In addition, from the perspective of welfare costs, the co-directional adjustment of the labor income tax and the capital income tax has an asymmetric amplification effect on social welfare, and the tax portfolio adjustment policy combined with an increase in government expenditure will lead to higher social welfare.

Key words: Labor Search and Matching, Income Taxation, Capital Taxation, Labor Share, Welfare Cost