While cross-sectional data show increasing income inequality in the United States, it is also important to examine how incomes change over time. Using income tax data, this paper provides new evidence on long-term and intergenerational mobility, and persistence at the top of the income...

Recent research on levels and trends in the United States in income inequality vary substantially in how they measure income. We show the sensitivity of alternative income measures in capturing income trends using a unified data set. Focusing solely on market income or including realized taxable...