Income inequality in the United States is at an all-time high, surpassing even levels seen during the Great Depression, according to a recently updated paper by University of California, Berkeley Professor Emmanuel Saez. The paper, which covers data through 2007, points to a staggering, unprecedented disparity in American incomes. On his blog, Nobel prize-winning economist and New York Times columnist Paul Krugman called the numbers "truly amazing."

Though income inequality has been growing for some time, the paper paints a stark, disturbing portrait of wealth distribution in America. Saez calculates that in 2007 the top .01 percent of American earners took home 6 percent of total U.S. wages, a figure that has nearly doubled since 2000.

As of 2007, the top decile of American earners, Saez writes, pulled in 49.7 percent of total wages, a level that's "higher than any other year since 1917 and even surpasses 1928, the peak of stock market bubble in the 'roaring" 1920s.'"

Beginning in the economic expansion of the early 1990s, Saez argues, the economy began to favor the top tiers American earners, but much of the country missed was left behind. "The top 1 percent incomes captured half of the overall economic growth over the period 1993-2007," Saes writes.