A long time ago in China, alone in the mountains stood a little village. There was something special about this village: they carried on a system of exchange the world had long abandoned. The blacksmith would pay the carpenter with some utensils for his help, the potter would pay the priest with some pots for any spiritual favors and so on. The doctor too was paid, but not for treating any illness. Villagers would pay him in kind, but only if they had NOT fallen ill that year!