The variance in the logarithms of per capita GDP in purchasing-power-parity prices increased prices increased in the world from 1960 to 1968 and decreased since the mid 1970s. In the later period the convergence in intercountry incomes more than offset any increase in within country inequality....

Despite the lower quality of education provided Africans compared with whites in South Africa, the percentage wage gains associated with additional years of primary, secondary, and higher education are substantially larger for Africans than for whites in 1993, and they increase for both race...