In human history, the so-called sharing economy is older than money and capitalism. Before anyone came up with the clever idea of giving set values to bits of metal and paper, people figured out that everyone could benefit by bartering and sharing. Sometimes this took the form of barter. You give me some of the fish you caught and I give you some of my crops. You help me harvest my field and I help you harvest yours. Sometimes it takes the form of gifts, seemingly given altruistically, but almost always returned at some point by a reciprocal gift or favor.