The Theory of Trade
The article discusses the evolution of trade theory from David Ricardo's principle of comparative advantage to modern models like Eaton-Kortum (2002). It explains how wages and specialization are determined in a multi-good, multi-country framework and highlights the limitations of classical models such as Heckscher-Ohlin. The shift toward more empirically grounded trade models reflects the difficulty in deriving real-world predictions from early theoretical assumptions.
- ▪David Ricardo demonstrated that mutually beneficial trade can occur even when one country is more efficient in producing all goods.
- ▪The Heckscher-Ohlin model predicts that countries export goods that intensively use their abundant factors of production, such as capital or labor.
- ▪Empirical challenges, like the Leontief Paradox, showed the United States exporting labor-intensive goods despite being capital-abundant, contradicting Heckscher-Ohlin predictions.
- ▪The Eaton-Kortum model builds on Ricardian principles by incorporating productivity differences across countries and many goods to better explain trade patterns.
- ▪Classical trade models rely on strong assumptions, such as identical production technologies across countries, which limit their empirical applicability.
Opening excerpt (first ~120 words) tap to expand
The Theory of TradeEaton-Kortum (2002)Nicholas DeckerMay 14, 20265324ShareTrade theory began in earnest with David Ricardo. There were, of course, many scattered antecedents, but none of them had the same systematized character as Ricardo’s famous demonstration of comparative advantage. Remarkably, even if someone is better at everything than another, both of them can benefit from trade.He gave an example with two countries, Portugal and England, and two goods, cloth and wine. We suppose that the two are fixed so as to trade at the same price. Portugal needs 90 workers to produce a unit of cloth and 80 to produce a unit of wine, while England needs 100 and 120 workers, respectively, to produce the same.
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