THE ECONOMIST: America’s New Aristocracy: As the importance of intellectual capital grows, privilege has become increasingly heritable.

Thomas Jefferson drew a distinction between a natural aristocracy of the virtuous and talented, which was a blessing to a nation, and an artificial aristocracy founded on wealth and birth, which would slowly strangle it. Jefferson himself was a hybrid of these two types—a brilliant lawyer who inherited 11,000 acres and 135 slaves from his father-in-law—but the distinction proved durable. When the robber barons accumulated fortunes that made European princes envious, the combination of their own philanthropy, their children’s extravagance and federal trust-busting meant that Americans never discovered what it would be like to live in a country where the elite could reliably reproduce themselves. . . .

Intellectual capital drives the knowledge economy, so those who have lots of it get a fat slice of the pie. And it is increasingly heritable. Far more than in previous generations, clever, successful men marry clever, successful women. Such “assortative mating” increases inequality by 25%, by one estimate, since two-degree households typically enjoy two large incomes. Power couples conceive bright children and bring them up in stable homes—only 9% of college-educated mothers who give birth each year are unmarried, compared with 61% of high-school dropouts. They stimulate them relentlessly: children of professionals hear 32m more words by the age of four than those of parents on welfare. They move to pricey neighbourhoods with good schools, spend a packet on flute lessons and pull strings to get junior into a top-notch college.

The universities that mould the American elite seek out talented recruits from all backgrounds, and clever poor children who make it to the Ivy League may have their fees waived entirely. But middle-class students have to rack up huge debts to attend college, especially if they want a post-graduate degree, which many desirable jobs now require. The link between parental income and a child’s academic success has grown stronger, as clever people become richer and splash out on their daughter’s Mandarin tutor, and education matters more than it used to, because the demand for brainpower has soared.

I don’t know, an awful lot of those Ivy League graduates are credentialed, but not educated. For them, I suppose, there’s always a career in journalism or politics.