The existing literature on welfare effects on female headship in the United States shows significant positive correlations in cross-section, possibly increasing over time. However, when geographic, or area, effects are permitted in the estimation, these correlations either disappear or reverse...

This paper examines the work incentives in the Social Security Disability Insurance (SSDI) Program under current law and proposed reforms. We begin with a discussion of the expected effect of the program on work effort according to the basic static labor supply model. In addition, we provide a...

Examines the causes of the decline in real AFDC benefits over the 1970's and 1980's and has focused on testing the hypothesis that states have allowed Food Stamps and Medicaid to substitute for AFDC in the total benefit package provided to female heads in the U.S.

Statistical methods for program evaluation with nonexperimental data have been studied by economists and econometricians over the last 20 years. These methods are concerned with laying out the precise circumstances under which valid nonexperimental estimates of the effects of an intervention can...

This paper proposes a nonparametric method of estimating marginal treatment effects in heterogeneous populations. Building upon an insight of Heckman and Vytlacil, the conventional treatment effects model with heterogeneous effects is shown to imply that outcomes are a nonlinear function of...