NATIONAL BUREAU OF ECONOMIC RESEARCH
NATIONAL BUREAU OF ECONOMIC RESEARCH

Product Differentiation, Multi-product Firms and Estimating the Impact of Trade Liberalization on Productivity

Jan De Loecker

NBER Working Paper No. 13155
Issued in June 2007

---- Acknowledgements -----

An earlier version of this paper was circulated under the title "Product Differentiation, Multi-Product Firms and Structural Estimation of Productivity". I am especially grateful to Joep Konings, Marc Melitz and Ariel Pakes for comments and suggestions. I would also like to thank Dan Ackerberg, Steve Berry, David Blackburn, Mariana Colacelli, Bronwyn Hall, Amil Petrin, Frank Verboven, Patrick Van Cayseele and Hylke Vandenbussche for discussions on earlier versions. This paper has benefited from seminar participants at University of Minnesota, Yale, Louvain-la-Neuve, KU Leuven, Princeton, NYU, U of Toronto, UT Austin, UCSC, IESE, Federal Board of Governors, LSE, WZB, NY Fed and conference participants at IIOC 2005, CEPR Applied IO Workshop 2005, NBER Summer Institute Productivity Workshop 2005, Midwest Meeting in International Economics 2005, NBER Productivity Workshop 2006, EIIT 2007. Furthermore, I would like to thank Roberta Adinolfi of EURATEX, Sylvie Groeninck of FEBELTEX, Yannick Hamon and Ignacio Iruarruzaga Diez at the European Commission for providing me with the relevant conversion tables to construct the quota data set. Contact Author: jdl16@nyu.edu. 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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