In gift exchange the definitive driver of the judgment is with respect to one's own costs and some other's benefit. The criterion is vitality; the objective is the need to maintain momentum to retain the creative energy of the thing. In a trade what defines the negotiation is my cost relative to your benefit in terms of my evaluation of what you get. I am adjusting my basket. In a gift exchange what defines the transaction is my sacrifice relative to my abundance in the context of your ability to amplify the value for yet others. I am adjusting what has not yet been made in order to maximize life.
Sacrifice and abundance vs costs and benefits.