Once upon a time, there was a person. He lived in a house and owned a shop. There he sold things to people. The people paid money for these things. This guy liked to use the money to buy other things from other people. Eventually he worked out a way with his people to just skip the money and trade his things for their useful things. Suddenly he fought them to the death for all their things the the human race regressed so much that it ended. The end.