Marry Your Like: Assortative Mating and Income Inequality
利用美国人口普查数据，发现选型婚配（高收入者与高收入者结婚）在上升，且若2005年婚配随机化，基尼系数将从0.43降至0.34，说明选型婚配加剧了家庭收入不平等。
Has there been an increase in positive assortative mating? Does assortative mating contribute to household income inequality? Data from the United States Census Bureau suggests there has been a rise in assortative mating. Additionally, assortative mating affects household income inequality. In particular, if matching in 2005 between husbands and wives had been random, instead of the pattern observed in the data, then the Gini coefficient would have fallen from the observed 0.43 to 0.34, so that income inequality would be smaller. Thus, assortative mating is important for income inequality. The high level of married female labor-force participation in 2005 is important for this result.