275%
Amount that average inflation-adjusted after-tax income grew for the 1 percent of the population with the highest income from 1979 to 2007, according to the Congressional Budget Office. For others in the top 20 percent of the population, average real after-tax household income grew by 65 percent. By contrast, the budget office said, for the poorest fifth of the population, average real after-tax household income rose 18 percent. And for the three-fifths of people in the middle of the income scale, the growth in such household income was just under 40 percent.