This paper considers semiparametric estimation of a sample selection model with endogenous covariates. In contrast to the existing literature, endogenous covariates are explicitly allowed in the main equation of interest as well as in the selection equation. A one-step GMM estimator based on polynomial approximations of unknown functions is proposed. It is shown that the estimator is consistent and ...
Several recent studies have focused attention on the relationship between welfare states and poverty, looking primarily at relative poverty and employing concepts of welfare state generosity that are problematic. This has made it difficult to evaluate claims that equality has come at the expense of economic growth. In this article, the authors examine more directly the relationship between welfare ...