Excellent piece from Brookings on earning inequality:" The spectacular economic rise of the top 1 percent is now common knowledge, thanks in large part to the work of Thomas Piketty and his collaborators . The top 1 percent of U.S. residents now earn 21 percent of total national income, up from 10 percent in 1979." One should also see Robert Reich's talk in 2013 on inequality.And read New York Times review of his book, Saving Capitalism. David Brooks says that "the choice explosion has contributed to widening inequality."