1. The Stolper-Samuelson Theorem:
Assumptions:
One country produces two goods (wheat and cloth) with two factors of production (capital and labor);
neither good is an input into the production of the other;
competition prevails;
factor supplies are given;
both factors are fully employed;
both factors are mobile between sectors (but not between countries);
one good (wheat) is capital-intensive and the other (cloth) is labor-intensive);
opening trade raises the relative price of the export good.

2. The Stolper-Samuelson Theorem
moving from no trade to free trade raises the returns to the factor used intensively in the rising-price industry, and lowers the returns to the factor used intensively in the falling-price industry, regardless of which goods the sellers of the two factors prefer to consume