Decomposing Lorenz and Concentration Curves*
分解了洛伦兹曲线和集中曲线，并用德国统一期间西德、东德和外籍工人的收入变化说明分解方法，发现东德收入在整体分布低分位集中度下降，而西德和外籍工人上升。
We decompose the Lorenz curve (LC) and its associated concentration curve (CC) by population subgroups. To illustrate these decompositions, we examine changes in earnings inequality among West Germans, East Germans, and foreign guest workers during the recent German unification. We show that East German earnings have become less concentrated in the lower deciles of the overall German earnings distribution, whereas the earnings of West Germans and foreign guest workers have become more concentrated in the lower deciles.