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First Author:
 
James J Heckman
University of Chicago
jjh.info@gmail.com
 
Department of Economics, 1126 E. 59th Street
Chicago, 60637, USA
 
7737020634(Phone)
7737020634(Fax)
http://heckman.uchicago.edu

Second Author:

Rodrigo Pinto
University of Chicago
rodrig@uchicago.edu
 
1126 E. 59th Street, 1126 E. 59th Street
Chicago, 60637, USA
 
 
 

Third Author:

Peter A. Savelyev
Vanderbilt University
peter.savelyev@vanderbilt.edu
 
Department of Economics, PMB 351819, 2301 Vanderbilt Place
Nashville, 37235-1819, USA