Inequality in the Distribution of Personal Income in the World: How It Is Changing and Why

The variance in the logarithms of per capita GDP in purchasing-power prices increased in the world from 1960 to 1968 and decreased since the mid 1970s. In the laterperiod the convergence in intercountry incomes more than offset any increase in within country inequality. Approximately two-thirds of this measure of worls inequality is intercountry, three-tenths interhousehold within country inequality, and one-twentieth between gender differences in education.