Data on income inequality in the United States indicate that

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Data on income mobility in the United States show that there is substantial movement among income groupings over time. While some families remain stuck in poverty or remain wealthy, many others move up or down the income distribution over time. Studies have shown that roughly 40% of families move up or down one income quintile over a decade, while about 10-20% move up or down two or more quintiles. So, income mobility is an important aspect of income inequality in the United States.

Data on Income Inequality in the United States Indicate That