Reading trade in the wealth of nations

Economic analysis identifies comparative, rather than absolute, advantage as the basis of international trade, a distinction first thought to have been clearly made by David Ricardo in his Principles of Political Economy and Taxation (1817). Adam Smith's Wealth of Nations (1776) is thought to have failed to make this distinction, instead treating foreign trade principally as a “vent” for surplus domestic produce. However, Smith's underlying argument in favour of a “system of natural liberty” made his name synonymous with open seas and free markets, and the economist most closely linked to free trade. This paper suggests that Smith advanced a rather more sophisticated analysis of the gains from trade than this textbook understanding would suggest, but that his line of reasoning has long been obscured by the long-established habit of reading Wealth of Nations as a work whose first two books contain the important analytical elements that the later books merely elaborate. It is demonstrated that Smith's analysis of the gains from trade derives from his discussion of capital, and that therefore a reader needs to begin at the end of Book II, and not with the principles of exchange outlined in Book I.