I discuss a new approach which decomposes inequality into the contributions of population groups by income sources. I estimate a matrix with rows and columns which indicate different population groups and income sources, respectively, with each element indicating the marginal change in the inequality contribution of a group (as measured by the Recentered Influence Function) when an income source is added and with all contributions adding up to overall inequality. The approach can be used to analyze the contributions of groups and sources to the trend in inequality over time (or between distributions), disentangling the effect of changes in the composition of the population by groups and changes in their income distribution by sources. An empirical application characterizes the distributional change in Spain following the Great Recession, highlighting the disequalizing role of the massive increase in unemployment or the equalizing effect of social protection through different population groups.

中文翻译：

---

人口群体和收入来源的不平等

我讨论了一种将不平等分解为按收入来源划分的人口群体贡献的新方法。我估计了一个矩阵，行和列分别表示不同的人口群体和收入来源，每个元素表示一个群体的不平等贡献的边际变化（由重新中心影响函数衡量），当增加收入来源时，所有贡献加起来构成总体不平等。该方法可用于分析群体和来源对不平等趋势随时间（或分配之间）的贡献，分解按群体划分的人口构成变化和按来源划分的收入分配变化的影响。一个实证应用描述了大衰退后西班牙的分配变化，