The education system in every country is a regular process and each year a big part of government budget and also private investments are allocated toward this system. In addition, some of the best years of every human are spent in schools and under education. Today, the economic effects of...

Empirical growth regressions typically include mean years of schooling as a proxy for human capital. However, empirical research often finds that the sign and significance of schooling depends on the sample of observations or the specification of the model. We use a nonparametric local-linear...