NATIONAL BUREAU OF ECONOMIC RESEARCH
NATIONAL BUREAU OF ECONOMIC RESEARCH

An Elementary Theory of Comparative Advantage

Arnaud Costinot

NBER Working Paper No. 14645
Issued in January 2009

---- Acknowledgements -----

I thank Pol Antras, Vince Crawford, Gene Grossman, Gordon Hanson, Navin Kartik, Giovanni Maggi, Marc Melitz, David Miller, Marc Muendler, Jim Rauch, Esteban Rossi-Hansberg, Jon Vogel, and seminar participants at many institutions for helpful comments and discussions. This project was initiated at the department of economics at UCSD and continued at the Princeton International Economics Section, which I thank for their support. A previous version of this paper was circulated under the title: "Heterogeneity and Trade". 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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