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From this study: The U.S. Income Distribution: Trends and Issues
Key Findings
Income inequality has increased over the past 40 years. It has increased most relative to the top of the income distribution, but inequality also grew among the lower 80%. In 1975, mean household income in the top quintile (i.e., top 20%) was 10.3 times greater than mean income in the bottom quintile; in 2019, it was 16.6 times greater. However, a less prominent trend of rising inequality can also be seen among households in the lower 80% of the income distribution. In 1975, mean income in the 4th quintile was 5.9 times greater than mean income in the bottom quintile; in 2019, it was 7.3 times greater.
Inequality was primarily driven by the relatively rapid growth of mean income in the top quintile. Relatively rapid growth in incomes at the top of the distribution was a significant driving factor over this period. Between 1975 and 2019, annualized growth rates were 0.4% for the bottom quintile, 0.6% for the 2nd quintile, 0.7% for the 3rd quintile, 0.9% for the 4th quintile, and 1.5% for the top quintile.
The pace and pattern of inequality growth has changed over time. Between the mid-1970s and 2000, high-income households experienced rapid real income growth relative to middle- and low-income households, but incomes grew on average for all quintiles. Between 2000 and 2010—a period that includes two economic recessions—average incomes fell in all quintiles of the distribution, and overall income inequality declined modestly. As the economy recovered over the 2010 to 2019 period, average incomes increased for each quintile, but the timing and pace of recovery varied. The top quintile was the first to have positive growth and the quickest to return to its pre-recession average income level. As a result, income inequality grew markedly over this period.
There are racial and ethnic differences in the distribution of household income. In 2019, 37% of all households (i.e., regardless of race) had annual incomes under $50,000 whereas the share among households with a Black householder (i.e., head of household) or a Hispanic householder was higher. Black-headed households and Hispanic-headed households were less represented at the very top of the distribution, where only 5% of Black-headed households and 5% of Hispanic-headed households had incomes of $200,000 or more, compared to 10% of all U.S. households. Asian-headed households were more uniformly distributed and had higher shares in the top two income groups than White- or Black-headed households.
Income mobility is limited, but households and individuals have not become significantly less mobile over time. Households (and tax units) do not necessarily stay in a given quintile from year to year; they can move up or down through distributional ranks over time. Such movement throughout the income distribution over time is called income mobility. In general, data from governmental sources reveal three broad trends: (1) households and individuals are not perfectly mobile, i.e., there is a relationship between one’s current rank in the distribution and past rankings; (2) individuals and households are more mobile over longer periods of time, (3) intergenerational mobility varies considerably along several dimensions within the United States.