In the early stages of trade, when economizing individuals are only slowly awakening to knowledge of the economic gains that can be derived from exploitation of existing exchange opportunities, their attention is, in keeping with the simplicity of all cultural beginnings, directed only to the most obvious of these opportunities.
In considering the goods he will acquire in trade, each man takes account only of their use-value to himself. Hence the exchange transactions that are actually performed are restricted naturally to situations in which economizing individuals have goods in their possession that have a smaller use value to them than goods in the possession of other economizing individuals who value the same goods in reverse fashion. A has a sword that has a smaller use value to him than B’s plough, while to B the same plough has a smaller use value than A’s sword—at the beginning of human trade, all exchange transactions actually performed are restricted to cases of this sort.
It is not difficult to see that the number of exchanges actually performed must be very narrowly limited under these conditions. How rarely does it happen that a good in the possession of one person has a smaller use value to him
