In the News (from Slate): “It’s not that rare these days for people to marry outside their ethnic or religious group or to live in a different region of the country from where they grew up. Among college-educated people, in particular, the tendency is not so much to marry within your community as to marry within your educational cohort. Every once in a while you do see a college graduate married to a high school dropout (my parents, for example), but it’s quite rare. Since incomes are normally measured on the household level for statistical purposes, it matters quite a bit to big-picture national trends. In particular, “assortative mating” of this kind is a major driver of household-level income inequality.
“How big? Jeremy Greenwood, Nezih Guner, Georgi Kocharkov, and Cezar Santosreport in a new paper that if in 2005 the matching of husbands and wives had been random, the Gini coefficient—the most common summary measure of income inequality—would have been 0.34 rather than its real-world 0.43, a difference of almost 25 percent.
Of course, saying that inequality would be lower if marriages were randomized isn’t telling us much. It’s long been the case that a college-educated woman’s husband is much more likely to have a college degree than would be suggested by pure chance. But a number of closely related demographic factors have shifted dramatically over the past generation or two in a way that’s made assortative mating a much more potent economic force. And the nexus between marriage patterns and those other trends is an important motor of inequality.”
My Comment: Egoism rules the world, not romance. Only requiring the equal distribution of income for everyone and the education of all, as if we all belong to the same family, will bring the world to calm. In the meantime, we still need to become convinced that our nature drives us to the manifestation of rejection and hatred in all its forms to come to the realization of egoism as absolute evil in order to seek the way to correct it.