Here is a funny story for your review: http://economistsview.typepad.com/economistsview/2005/09/yapping_about_m.html The gist of it is, on a small island the locals use as their currency massive (several tons) stone wheels. The stone wheels are so massive and difficult to move, they don't move them. When someone would like to pay for something, say, some chickens or a house, they simply change ownership of the stone wheel to the other person. Everyone knows who the wheels belong to, so theres no need to actually move the money around. Additionally, the stone wheels come from a distant island and are hard to get, which curbs inflation. Once, they tried to transport some stone wheel around the island by boat. The boat sank, and it was a great tragedy, when they thought - wait, it doesnt matter if the stones are underwater. We knew what they were, who owned them, etc. So now people change ownership of some stones several meters underwater, without ever seeing them. The funny thing is, this money works just perfectly fine. Money doesn't need to exist at all for people to use money. All that needs exist is the idea of it.