In this paper, we assess whether welfare reform affects earnings only through mean impacts that are constant within but vary across subgroups. This is important because researchers interested in treatment effect heterogeneity typically restrict their attention to estimating mean impacts that are...

In this chapter I discuss the history and basic incentive effects of two key U.S. cash assistance programs aimed at families with children. Starting roughly in the 1980s, critics of the Aid to Families with Dependent Children (AFDC) program argued that the program -- designed largely to cut...

In this paper, we assess whether welfare reform affects earnings only through mean impacts that are constant within but vary across subgroups. This is important because researchers interested in treatment effect heterogeneity typically restrict their attention to estimating mean impacts that are...