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本文建立了一个考察收入波动与基尼系数关系的模型,并通过计算机模拟实验证实:给定任何终生收入不平等状况,收入波动性增加都将导致各期的基尼系数增大。即,在终生收入不平等状况不变的情况下,各期的基尼系数也可因收入波动性增加而增大。考虑到我国经济转轨进程中家庭收入波动性日益增加的事实,则本文结论意味着,仅以基尼系数为判断标准很可能在一定程度上高估我国的家庭收入不平等状况。
This paper establishes a model to examine the relationship between income volatility and Gini coefficient and confirms by computer simulations that any increase in income volatility will lead to an increase in Gini coefficient for any given period of income inequality. That is, given the inequality of lifetime income inequality, the Gini coefficient of each period may also increase due to the increase of income volatility. Taking into account the fact that the volatility of household income is increasing in the process of economic transition in our country, the conclusion of this paper means that it is probable that the Gini coefficient alone will overestimate the inequality of household income in our country.