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.