Subgroup Decomposition of the Gini Coefficient: A New Solution to an Old Problem
提出一种将基尼系数分解为组内和组间不平等项的新方法，这些项之和等于总基尼系数，且分解满足一组公理，计算简单并有几何解释。
We derive a novel decomposition of the Gini coefficient into within‐ and between‐group inequality terms that sum to the aggregate Gini coefficient. This decomposition is derived from a set of axioms that ensure desirable behavior for the within‐ and between‐group inequality terms. The decomposition of the Gini coefficient is unique given our axioms, easy to compute, and can be interpreted geometrically.