This paper examines how factor proportions determine the structure of commodity trade. It integrates a many-country version of a Heckscher-Ohlin model with a continuum of goods with Paul R. Krugman's (1980) model of monopolistic competition and transport costs. The commodity structure of production and bilateral trade is fully determined. Two main predictions emerge. Countries capture larger shares of world production and trade of commodities that more intensively use their abundant factors. Countries that rapidly accumulate a factor see their production and export structures systematically shift towards industries that intensively use that factor. Both predictions receive support from detailed trade data.

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The unit values of internationally traded goods are heavily influenced by quality. We model this in an extended monopolistic competition framework where, in addition to choosing price, firms simultaneously choose quality subject to nonhomothetic demand. We estimate quality and quality-adjusted price indexes for 185 countries over 1984–2011. Our estimates are less sensitive to assumptions about the extensive margin of firms than are purely “demand-side” estimates. We find that quality-adjusted prices vary much less across countries than do unit values and, surprisingly, the quality-adjusted terms of trade are negatively related to countries’ level of income.