From Politica
Taken from The Works of Aristotle, Vol. X, ed. W. D. Ross, M.A., Benjamin Jowett, E. S. Forster and Frederic G. Kenyon, Clarendon Press. Oxford, 1921, Book I Chapter 9, pp. 1257a–1257b.
Let us begin our discussion of the question with the following considerations:
Of everything which we possess there are two uses: both belong to the thing as such, but not in the same manner for one is the proper, and the other the improper or secondary use of it. For example, a shoe is used for wear, and is used for exchange; both are uses of the shoe. He who gives a shoe in exchange for money or food to him who wants one, does indeed use the shoe as a shoe, but this is not its proper or primary purpose, for a shoe is not made to be an object of barter. The same may be said of all possessions, for the art of exchange extends to all of them, and it arises at first from what is natural, from the circumstance that some have too little, others too much…
