This paper develops a model of international trade based on the division of labor under perfect competition. International trade, by eliminating the duplication of coordination costs, leads to a greater variety of tasks, each produced at a larger scale than in autarky. The greater variety of tasks implies greater division of labor and hence gains from trade. Extending the model to two factors of production yields the additional result that if the two countries are sufficiently similar in their relative endowments, then both factors of production can experience gains from trade.