Essence of Exchange
The Trade Pattern signifies simple reciprocation. It is one aspect of the more foundational Pattern, Exchange. Trade demonstrates the reciprocal exchange of the unique resources of one element with the unique resources of another element. The amount and value of resource moving in both directions must be balanced with each other. The role of Trade is to improve the productivity of all elements of a system by supporting specialization.
The principle of reciprocity: the enduring health of any system depends on the balance and integration of the exchange of different resources between unique elements, for a given context.