This document discusses the principles of comparative advantage and absolute advantage in international trade. It explains that comparative advantage refers to a country's ability to produce a good at a lower opportunity cost than other countries, even if it is not the most efficient overall producer. The document provides examples to illustrate comparative advantage between two countries in producing cotton and wheat. It shows that both countries can benefit from specializing in the good they have a comparative advantage in and trading, resulting in overall surplus gains. Some assumptions and limitations of the comparative advantage model are also outlined.