基尼系数的子群分解：一个老问题的新解
Subgroup Decomposition of the Gini Coefficient: A New Solution to an Old Problem
Econometrica · 2026 · [{"name": "Vesa-Matti Heikkuri", "affiliation": ["Tampere University"]}, {"name": "Matthias Schief", "affiliation": ["Organisation de Coopération et de Développement Economiques"]}]
中文摘要
我们推导出基尼系数的一种新分解,将其分解为组内不平等项与组间不平等项,二者之和等于总体基尼系数。该分解源自一组公理,这些公理确保组内与组间不平等项具有理想的性质。在给定这些公理的条件下,基尼系数的这一分解是唯一的、易于计算的,并可从几何角度加以解释。
Abstract
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.