There has long been a need for a systematic introduction to the modern pure theory of international trade that would take the student through a careful introduction to the tools of analysis and the main logical propositions into the application of the theory to practical problems of international economic policy. Trade theory should be part and parcel of price theory, distinguished only by the fact that other countries form part of the natural opportunities--and natural constraints--that a country confronts in its efforts to bend nature to its desire to produce utility-yielding goods and...