chapter  IX
The Mechanism of Markets
Pages 14

I § I.-COMMERCE, or the art of exchange, enables any person with a claim upon some particular product to convert it into a claim upon any other sort of product. A person thus exchanging anything for something else is actuated by one of two motives: either he desires to exchange his superfluous product in order to get some other articles which he wishes to consume, or else he desires to get some materials,.tools, or other concrete capital to use in some process of production.