Sanghoon Lee

Sauder School of Business
University of British Columbia
2053 Main Mall
Vancouver, BC V6T1Z2

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NBER Working Papers and Publications

August 2013Allocative Efficiency, Mark-ups, and the Welfare Gains from Trade
with Thomas J. Holmes, Wen-Tai Hsu: w19273
This paper develops an index of allocative efficiency that depends upon the distribution of mark-ups across goods. It determines how changes in trade frictions affect allocative efficiency in an oligopoly model of international trade, decomposing the effect into the cost-change channel and the price-change channel. Formulas are derived shedding light on the signs and magnitudes of the two channels. In symmetric country models, trade tends to increase allocative efficiency through the cost-change channel, yielding a welfare benefit beyond productive efficiency gains. In contrast, the price-change channel has ambiguous effects on allocative efficiency.

Published: Holmes, Thomas J. & Hsu, Wen-Tai & Lee, Sanghoon, 2014. "Allocative efficiency, mark-ups, and the welfare gains from trade," Journal of International Economics, Elsevier, vol. 94(2), pages 195-206. citation courtesy of

February 2009Economies of Density versus Natural Advantage: Crop Choice on the Back Forty
with Thomas J. Holmes: w14704
We estimate the factors determining specialization of crop choice at the level of individual fields, distinguishing between the role of natural advantage (soil characteristics) and economies of density (scale economies achieved when farmers plant neighboring fields with the same crop). Using rich geographic data from North Dakota, including new data on crop choice collected by satellite, we estimate the analog of a social interactions econometric model for the planting decisions on neighboring fields. We find that planting decisions on a field are heavily dependent on the soil characteristics of the neighboring fields. Through this relationship, we back out the structural parameters of economies of density. Setting an Ellison-Glaeser dartboard level of specialization as a benchmark, we ...

Published: Thomas J. Holmes & Sanghoon Lee, 2012. "Economies of Density versus Natural Advantage: Crop Choice on the Back Forty," The Review of Economics and Statistics, MIT Press, vol. 94(1), pages 1-19, 07. citation courtesy of

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