The empirical association between schooling and economic success is one of the most secure findings in the social sciences. With rare exceptions, across societies and historical periods those with more schooling or particular types of schooling have held significant material advantages over those with less schooling. While not perfect, the empirical associations between schooling and economic success are high, persistent, and according to many accounts, increasing. Schooling in many societies is now generally regarded as the key to both individual and collective social mobility.