A review of the theoretical twists and turns in the development of the Heckscher-Ohlin model and an empirical assessment of the basic model and three related theorems. No names are more closely associated with modern trade theory than Eli Heckscher and Bertil Ohlin. The basic Heckscher-Ohlin proposition, according to which a country exports factors in abundant supply and imports factors in scarce supply, is a key component of modern...