The magic faucet or why the money flows upward

There once was a magic faucet in a world without oceans, rivers, lakes and rain. The valve was connected to any water line, yet he constantly bubbled jolly and happy. The fresh water flowing out from nowhere and took care of the thirsty. But he was also greedy. He gave away his water to the thirsty but not only gave it. The thirsty had to give him back the water later. He also demanded the return of a little more water than ever hire. Since the magical tap was the only water tap in the world, unfortunately, was never enough water there. Also, the additional water that had to be returned so as an additional fee, one could obtain only from the tap. So it was that more and more people had water debts, stealing each other more and more people died of thirst and water more and more people.