You can see America’s creeping Serrata in the growing social and, especially, educational chasm between those at the top and everyone else. At the bottom and in the middle, American society is fraying, and the children of these struggling families are lagging the rest of the world at school.

Economists point out that the woes of the middle class are in large part a consequence of globalization and technological change. Culture may also play a role. In his recent book on the white working class, the libertarian writer Charles Murray blames the hollowed-out middle for straying from the traditional family values and old-fashioned work ethic that he says prevail among the rich (whom he castigates, but only for allowing cultural relativism to prevail).

There is some truth in both arguments. But the 1 percent cannot evade its share of responsibility for the growing gulf in American society. Economic forces may be behind the rising inequality, but as Peter R. Orszag, President Obama’s former budget chief, told me, public policy has exacerbated rather than mitigated these trends.

Survival of the fittest suggests that it's the most adaptable that thrive.

Having said that, I agree that the 1 percent needs to take responsibility for the rising inequality. They should know better than to let things get this out of hand.