Recent developments on program evaluation account for individual-level heterogeneity in treatment effects. In a wide variety of applications, the available evidence suggests that not only are ex-post responses heterogeneous, but that ex ante decisions to participate in programs are based, in part, on these heterogeneous responses. An important consequence in the presence of selection on idiosyncratic treatment effects is that no single "effect" describes a program or intervention. Under such circumstances, the authors present some conditions under which it is possible to represent all of the conventional population treatment parameters as weighted versions of the marginal treatment effect (MTE), where different parameters correspond to different weights.
Bibliography: Heckman, James J. and Edward Vytlacil. 2001. "Policy-Relevant Treatment Effects." The American Economic Review (Papers and Proceedings). May 2001. Vol. 91(2) : 107-111.
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