For years now, people have been talking about the insulated world of the top 1 percent of Americans, but the top 20 percent of the income distribution is also steadily separating itself — by geography and by education as well as by income.
...Smeeding finds that the gap between the average income of households with children in the top quintile and households with children in the middle quintile has grown, in inflation-adjusted dollars, from $68,600 to $169,300 — that’s 147 percent.
In an earlier paper, Smeeding and two co-authors wrote that
we have seen a threefold increase between 1972 and 2007 in top-decile spending on children, an increase that suggests that parents at the top may be investing in ever more high-quality day care and babysitting, private schooling, books and tutoring, and college tuition and fees.
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Equally or perhaps more important, the affluent dominate the small percentage of the electorate that makes campaign contributions.
The top fifth have been prospering while the majority lags behind. But the separation is not just economic. Gaps are growing on a whole range of dimensions, including family structure, education, lifestyle, and geography. Indeed, these dimensions of advantage appear to be clustering more tightly together, each thereby amplifying the effect of the other.
