The Heckscher-Ohlin-Samuelson (HOS) Theorem

The Heckscher-Ohlin-Samuelson (HOS) theorem is a fundamental proposition in international trade theory, explaining patterns of trade based on differences in factor endowments between countries. Named after Swedish economist Eli Heckscher, Swedish economist Bertil Ohlin, and American economist Paul Samuelson, this theorem provides insights into the determinants of comparative advantage and helps explain the direction of trade flows.

The Basic Idea:

The HOS theorem builds upon the Ricardian model of comparative advantage, which posits that countries specialize in producing goods in which they have a comparative advantage, i.e., they can produce at a lower opportunity cost relative to other countries. However, unlike the Ricardian model, which focuses on differences in technology as the sole determinant of comparative advantage, the HOS theorem incorporates differences in factor endowments, particularly capital and labor.

Assumptions:

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