Originally money was simply a receipt; if u brought two chickens to the temple to sacrifice on the alter, the priest gave u a slip of papyrus that said 'two chickens' & u'd go to the baker & get a loaf of bread & hand the baker the slip worth two chickens, which is a lot for a loaf of bread; so the next time u bring a cow to the temple & get a piece of paper that said a cow; well, says the baker, moving up in the world are ya? So u write 'my house' on a piece of paper & trade it for a horse & u just sold ur house for a horse; so as long as u've got paper & ink & collateral u have money; now obviously where there's money there's crime so someone with only pen & ink can make receipts for things they don't possess & pass them off as wealth; think subprime morgages