A report from the World Bank entitled "Education Quality and Economic Growth" begins:

"Schooling has not delivered fully on its promise as the driver of economic success. Expanding school attainment, at the center of most development strategies, has not guaranteed better economic conditions. What’s been missing is attention to the quality of education–ensuring that students actually learn. There is strong evidence that the cognitive skills of the population, rather than mere school enrollment, are powerfully related to individual earnings, to the distribution of income, and to economic growth. And the magnitude of the challenge is clear–international comparisons reveal even larger deficits in cognitive skills than in school enrollment and attainment in developing countries."