劳动收入份额和收入不平等存在相互影响吗

Labor Income Share and Inequality: Do They Affect Each Other Interactively?

劳动收入份额和收入不平等可能存在相互影响,这尚未得到充分研究。采用双方程向量自回归模型,利用1998—2016年省级面板数据,检验两者的相互影响关系。结果表明,劳动收入份额上升虽然当年加剧收入不平等,但随后一年的影响方向大幅反转,总体呈现降低不平等的效应;而收入不平等对劳动收入份额的影响则不显著。格兰杰检验表明,劳动收入份额是收入不平等的格兰杰原因,但收入不平等不是劳动收入份额的格兰杰原因。这意味着,我国过去20年中收入不平等变化对劳动收入份额变化没有显著影响,但提升劳动收入份额却有助于改善收入不平等。

Labor income share and income inequality may have interactive effects,which has been rarely studied yet.This paper employs a two-equation vector autoregressive model and makes use of the provincial panel data in China from 1998 to 2016 to investigate the interaction between the two.The results show that although the increase in labor income share will increase inequality in the same year,the direction of the influence in the following year will reverse greatly,and the overall effect of reducing inequality can be seen;while the impact of income inequality on labor income share is not significant.The result of Granger test shows that labor income share is the Granger cause for income inequality;however,the income inequality is not the Granger cause for labor income share.This means that changes in income inequality over the past two decades have had no significant impact on changes in the share of labor income,however,increasing the share of labor income can help to lessen income inequality.