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This statistic shows the Gini coefficient, an index for measuring income distribution, for individual earnings for full-time, year-round workers in the U.S. from 1990 to 2010. A Gini coefficient of 0 expresses perfect equality, where all would have the same income,a Gini coefficient of 1 expresses maximal inequality among values. In 2010, the Gini coefficient for individual income was 0.4. This is an increase since the Gini coefficient 1990 of 0.36 points, indicating an increase of income inequality in the United States.