Factor Supply and Substitution, the second in a three-volume study entitled Trade and Employment in Developing Countries, extends the analysis of trade regimes and employment both in depth for single countries and through cross-country analyses. It provides important new evidence of the effects of different trade policies and of the effects of the various factors that make up these policies—exchange rates, wages, social insurance and other taxes, credit, prices, and so on. All six studies reflect a carefully coordinated research strategy that has been carried out by a first-rate team. The researchers combine technical expertise with specialized knowledge of the individual countries.