NATIONAL BUREAU OF ECONOMIC RESEARCH
NATIONAL BUREAU OF ECONOMIC RESEARCH

Comparing IV With Structural Models: What Simple IV Can and Cannot Identify

James J. Heckman, Sergio Urzua

NBER Working Paper No. 14706
Issued in February 2009

---- Acknowledgements -----

We thank Donna Gilleskie, Daniel Schmierer, Greg Veramendi and an anonymous referee for helpful comments. This project was supported by NSF grant SES-0241858, NIH grant R01-HD043411, a grant from the Geary Institute, University College Dublin, and a grant from the American Bar Foundation. The views expressed herein are those of the author(s) and do not necessarily reflect the views of the National Bureau of Economic Research.

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