关键词: 拓展基尼系数, 分解式, 消费结构

Abstract: This paper promotes an equivalent definition of the extended Gini coefficient, and proposes an unite decomposition formula of the extended Gini coefficient by subgroups and factors. Applying the formula to 2009 China’s food consumption data yields several interesting results as follows: ⑴the extended Gini coefficient is an increasing function of aversion inequality parameter, with the minimum 0 and the maximum 1- S1/p1; ⑵with the parameter increasing, the relative marginal effects of subgroups or factors on the extended Gini coefficient have rather stable action direction; ⑶it will has a negative effect on food expenditure inequality to increase dining out, meat, poultry and processed products, aquatic products expenditure ratio.

Key words: The Extended Gini Coefficient, Decomposition Formula, Consumption Structure