For those who grind their ideological axes on these numbers, the increase in measured inequality since the 1970s is proof that the new, more competitive, more entrepreneurial economy of recent decades (which also happens to be less taxed and less unionized) has somehow failed to provide widespread prosperity. According to left-wing doom-and-gloomers, only an "oligarchy" at the very top is benefiting from the current system.

Hogwash. This argument can be disposed of with a simple thought experiment. First, picture the material standard of living you could have afforded back in 1979 with the median household income then of $16,461. Now picture the mix of goods and services you could buy in 2004 with the median income of $44,389. Which is the better deal? Only the most blinkered ideologue could fail to see the dramatic expansion of comforts, conveniences and opportunities that the contemporary family enjoys.

Much of the increase in measured inequality has nothing to do with the economic system at all. Rather, it is a product of demographic changes. Rising numbers of both single-parent households and affluent dual-earner couples have stretched the income distribution; so, too, has the big influx of low-skilled Hispanic immigrants. Meanwhile, in a 2006 paper published in the American Economic Review, economist Thomas Lemieux calculated that roughly three-quarters of the rise in wage inequality among workers with similar skills is due simply to the fact that the population is both older and better educated today than it was in the 1970s.

It is true that superstars in sports, entertainment and business now earn stratospheric incomes. But what is that to you and me? If the egalitarian left has been reduced to complaining that people in the 99th income percentile in a given year (and they're not the same people from year to year) are leaving behind those in the 90th percentile, it has truly arrived at the most farcical of intellectual dead ends. <...>

The problem is not lack of opportunity. If it were, the country wouldn't be a magnet for illegal immigrants. The problem is a lack of elementary self-discipline: failing to stay in school, failing to live within the law, failing to get and stay married to the mother or father of your children. The prevalence of all these pathologies reflects a dysfunctional culture that fails to invest in human capital.

Other, less acute deficits distinguish working-class culture from that of the middle and upper classes. According to sociologist Annette Lareau, working-class parents continue to follow the traditional, laissez-faire child-rearing philosophy that she calls "the accomplishment of natural growth." But at the upper end of the socioeconomic scale, parents now engage in what she refers to as "concerted cultivation" -- intensively overseeing kids' schoolwork and stuffing their after-school hours and weekends with organized enrichment activities.

This new kind of family life is often hectic and stressful, but it inculcates in children the intellectual, organizational and networking skills needed to thrive in today's knowledge-based economy. In other words, it makes unprecedented, heavy investments in developing children's human capital.

To not paraphrase Marie Antoinette: "Let them send their kids to Montessori schools."

This was in the Wall Street Journal.  This is what the upper-middle class to rich will tell themselves to assuage any potential sense of guilt over the growing inequality in the U.S.

Truth unfolds in time through a communal process.