The Relevance of the Two-Sector Production Model in Trade Theory

This paper examines how well the basic properties of the traditional 2 × 2 model of a competitive economy, commonly used in much of the pure theory of international trade, generalize when more goods and factors are considered. The notion of factor intensity and the Hekscher-Ohlin, Stolper-Samuelson, and Rybczynski theorems are discussed. The role played by the no-joint-production assumption as opposed to small dimensionality in the latter two results is stressed. The mathematical appendix provides a compact and formal statement of the properties discussed in the text.