Stolper-Samuelson theorem

The Stolper-Samuelson theorem states that when a country opens up to international trade, the prices of goods that use certain resources intensively will influence those resources’ incomes. Specifically, if the price of a good made with a particular resource rises, the income of the owners of that resource tends to increase, while the income of owners of the other resource tends to decrease. Conversely, if the price falls, resource owners facing the costlier resource may suffer. This relationship explains how trade benefits specific groups within a country depending on the industries they work in.