Frome a Paul Krugman editorial in the New York Times
A new research paper by Ian Dew-Becker and Robert Gordon of Northwestern University, "Where Did the Productivity Growth Go?," gives the details. Between 1972 and 2001 the wage and salary income of Americans at the 90th percentile of the income distribution rose only 34 percent, or about 1 percent per year. So being in the top 10 percent of the income distribution, like being a college graduate, wasn't a ticket to big income gains.
But income at the 99th percentile rose 87 percent; income at the 99.9th percentile rose 181 percent; and income at the 99.99th percentile rose 497 percent. No, that's not a misprint.
Just to give you a sense of who we're talking about: the nonpartisan Tax Policy Center estimates that this year the 99th percentile will correspond to an income of $402,306, and the 99.9th percentile to an income of $1,672,726. The center doesn't give a number for the 99.99th percentile, but it's probably well over $6 million a year.