Complete the following paragraph to explain how the international movements of increases among nations. factor inputs promote an equalization of factor prices decreases The Stolper - Samuelson theorem states that an increase in the price of a product ____ , the income earned by resources that are used intensively in its production. Conversely, a decrease in the price of a product. _____, the income of the resources that it uses intensively. theorem _____ that all the resources used in the export industries are better off.