The unequal distribution of individual or household income across an economy or in a society. Income inequality in the United States is generally recognized as being substantially higher than in most other developed nations and even some developing countries. The Congressional Budget Office has reported that between 1979 and 2007, the after-tax income of the top 1% of American households rose 275% while income for the 60% of the population in the middle of the pack grew just 37%. The share of total after-tax income received by the top 1% of the population more than doubled during that time, while the share received by low- and middle-income households declined. The CBO concluded that income distribution in the United States was substantially more unequal in 2007 than in 1979.