Airplanes and Comparative Advantage
NBER Working Paper No. 11688
---- Acknowledgements -----
This paper has benefited from audience comments at Ljubljana, Illinois, Michigan, Columbia, the World Bank, NBER, CEPR, Hitotsubashi, Tokyo, City University of Hong Kong, and Hong Kong University of Science and Technology. I thank Christina Marsh and Geoffrey Barrows for excellent research assistance. The views expressed herein are those of the author(s) and do not necessarily reflect the views of the National Bureau of Economic Research.