Jonathan Rothwell at Brookings:
... In his “defense of the one percent,” economist Greg Mankiw argues that elite earnings are based on their higher levels of IQ, skills, and valuable contributions to the economy. The globally-integrated, technologically-powered economy has shifted so that very highly-talented people can generate very high incomes.
It is certainly true that rising relative returns to education have driven up inequality. But as I have written earlier, this is true among the bottom 99 percent. There is no evidence to support the idea that the top 1 percent consists mostly of people of “exceptional talent.” In fact, there is quite a bit of evidence to the contrary.
Drawing on state administrative records for millions of individual Americans and their employers from 1990 to 2011, John Abowd and co-authors have estimated how far individual skills influence earnings in particular industries. They find that people working in the securities industry (which includes investment banks and hedge funds) earn 26 percent more, regardless of skill. Those working in legal services get a 23 percent pay raise. These are among the two industries with the highest levels of “gratuitous pay”—pay in excess of skill (or “rents” in the economics literature). At the other end of the spectrum, people working in eating and drinking establishments earn 40 percent below their skill level. ...
Much more here.