Part 1 Origins and definition: evolution of practices, methods and structures of international trade since the 11th century; the different functions in international trade; an approach to world commodity markets. Part 2 Functioning and rationale of international trading firms: the trader's function; the trader's many jobs; classification and evolution of trading. Part 3 The major trading firms and their environment: the grain trade; the sugar trade; the coffee and cocoa trade; the non-ferrous metals trade; trade in some other major commodities.