Econometric analyses of treatment response commonly use instrumental variable (IV) assumptions to identify treatment effects. Yet the credibility of IV assumptions is often a matter of considerable disagreement. There is therefore good reason to consider weaker but more credible assumptions. To...

Using a nonparametric bounding method and data from the Panel Study of Income Dynamics, I examine the effect that growing up in a household that receives Aid to Families with Dependent Children (AFDC) has on welfare participation as a young adult. In light of the ambiguities created by the...