Annual Inequality and Lifetime Inequality

Abstract
An estimator of inequality in lifetime incomes is derived. It can be computed for a population from the distribution of incomes in one year. As a result, the estimates are as easily calculated as measurements of annual inequality, but can be used as measurements of lifetime inequality. Estimates from this measure and two others have been computed for selected years since 1947. The results are compared by their implications for the level and trend of inequality in the United States.

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