Income Tax Progressivity: Trends and Implications
提出一种基于Kakwani指数的税收累进性衡量方法，发现过去几十年累进性下降，但累进性与经济增长关系不显著，而提高累进性会降低税前不平等。
Abstract This paper discusses how the structure of the tax system affects its progressivity. It suggests a measure of progressive capacity of tax systems, based on the Kakwani index, but independent of pretax income distributions. Using this and other progressivity measures, the paper (i) documents a decline in progressivity over the last decades and (ii) examines the relationship between progressivity and economic growth. On this relationship, regressions do not reveal a significant impact, suggesting that efficiency costs may be small – at least for degrees of progressivity observed in the sample. Finally, the paper finds that increasing tax progressivity reduces pretax inequality.