If you imagine that everything is an exchange, then we're supposed to just transact and walk away. If we haven't walked away and we still have a relationship, it's because there's a debt.
David GraeberWe need each other to do things that we can't do for ourselves. If we are intimately connected with each other, we just give things to each other; if we don't know each other we find another way to handle it. If you think about it, each according to his or her abilities and each according to his or her needs is sort of the same thing as supply and demand.
David Graeber