In this paper, we investigate the responsiveness of the demand for college to changes in student aid arising from a Danish reform. We separately identify the effect of aid from that of other observed and unobserved variables such as parental income. We exploit the combination of a kinked aid...

This paper specifies a general set of conditions under which the impacts of a policy can be identified using data generated under a different policy regime. We show that some of the policy impacts can be identified under relatively weak conditions on the data and structure of a model. Based on...

In the last thirty years we have witnessed large increases in the "returns to skill." These changes in the wage structure have renewed interest in increasing the skill levels of low skill workers. Attempts to do this through job training programs have been largely unsuccessful as the wage gains...

Despite the large amount of work in labor economics devoted towards wage progress we know surprisingly little about the mechanics of wage growth, particularly among low skilled workers. This paper takes a step in this direction by examining wage progression between and among moderate to low...

We develop estimation methods that use the amount of selection on the observables in a model as a guide to the amount of selection on the unobservables. We show that if the observed variables are a random subset of a large number of factors that influence the endogenous variable and the outcome...