U.S. income inequality has been growing for almost three decades. But until last year, the top 1 percent’s share of pre-tax income hadn’t surpassed the 18.7 percent it reached in 1927, according to an analysis of IRS figures dating to 1913 by economist Emmanuel Saez of the University of California, Berkeley, and three colleagues.
http://business.time.com/2013/09/10/top-1-percent-took-record-share-of-2012-u-s-income/