Update on trends in assortative mating

From Marriage: Homogamy or Heterogamy by Timothy Taylor. Some additional data regarding trends in assortative mating.

In short, social and economic inequality clearly interact with marriage homogamy. On one side, in a society with higher levels of inequality, people are less likely to interact with others from different socioeconomic groups in a way that would lead to heterogamy. On the other side, a society with more marriage homogamy will will be one in which those with higher wage and employment prospects are marrying each other. As a result, differences in household income will be larger. In addition, those households will have greater resources to invest in their children, which could lead to a greater persistence of inequality across generations.