In this book, originally published in 1937, Jacob Viner traces, in a series of studies of contemporary source-material, the evolution of the modern orthodox theory of international trade from its beginnings in the revolt against English mercantilism in the 17th and 18th centuries, through the English currency and tariff controversies of the 19th century, to the late 20th century. The author offers a detailed examination of controversies in the technical literature centering on important propositions of the classical and neo-classical economists relating to the theory of the mechanism of international trade and the theory of gain from trade.