The canonical supply{demand model of the wage returns to skill has been extremely in uential; however, it has faced several important challenges. Several studies show that the standard approach sometimes produces theoretically wrong-signed elasticities of substitution, yields counterintuitive...

Human Capital Theory considers individuals' education as an investment in terms of money, time, effort, and the renouncement of income opportunities that they expect will be compensated during their working life. While these benefits are mainly in the long run, direct and indirect costs are...