In advanced trade theory, what does the 'Stolper-Samuelson Theorem' demonstrate regarding the distribution of real income resulting from international trade?

💡 Solution & Explanation

The Stolper-Samuelson Theorem, derived within the Heckscher-Ohlin framework, establishes that an increase in the relative price of a good leads to an increase in the real return to the factor used intensively in producing that good, and a decrease in the real return to the other factor. For example, if a labor-abundant country opens up to trade and the price of its exportable labor-intensive good rises, the real wage of labor increases while the real rental rate of capital declines. This theorem provides crucial theoretical backing for understanding why international trade creates domestic winners and losers, influencing political economy debates on tariff protections. A related trade principle is the Factor Price Equalization theorem, which posits that free trade equalizes factor prices across countries.