Heckman, James J. (contributor); Urzua, Sergio (contributor) - 2006
economics, (ii) development of policy concepts, and (iii) dissemination of research
results and concepts to the interested …:
James J. Heckman
Department of Economics
University of Chicago
1126 East 59th Street
Chicago, IL 60637
USA
E-mail: j … American Bar Foundation. An early version of this paper was
presented as the Review of Economics and Statistics Lecture at …