Firm Heterogeneity and Aggregate Welfare
---- Acknowledgements -----
We are grateful to Harvard and Princeton Universities for research support. We would like to thank Pol Antras, Costas Arkolakis, Ariel Burstein, Arnaud Costinot, Gene Grossman, Elhanan Helpman, Andres Rodriguez-Clare, Esteban Rossi-Hansberg and Jon Vogel for helpful comments. We are also grateful to David Krisztian Nagy for research assistance. Responsibility for any results, opinions and errors is the authors' alone. The views expressed herein are those of the authors and do not necessarily reflect the views of the National Bureau of Economic Research.