This book covers a broad range of topics in the history of economics that have relevance to economic theories. The author believes that one of the tasks for a historian of economics is to analyze and interpret theories currently outside the mainstream of economic theory, in this case non-Walrasian economics. By doing so, he argues, new directions and new areas for research can be developed that will extend the current theories. Familiar topics covered include: the division of labor, economies of scale, wages, profit, international trade, market mechanisms, and money. These are considered in the light of the well-known non-Walrasian schools of thought: the classical, Marxian, Austrian, and Cambridge schools.