**Definition:**The Stolper-Samuelson theorem is as follows: In some models of international trade, trade lowers the real wage of the scarce factor of production, and protection from trade raises it. That is a Stolper-Samuelson effect, by analogy to their (1941) theorem in a Heckscher-Ohlin model context.

A notable case is when trade between a modernized economy and a developing one would lower the wages of the unskilled in the modernized economy because the developing country has so many of the unskilled.

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