I never said it can't be used multiple times, it can be. That is, right up until someone uses it to pay their principle with. In your analogy, had the pig farmer paid his debt to the bank instead, the $100 bill would be gone and the hotel proprietor would have ended up being charged with theft. ie your analogy assumes that the "money" can circulate foever, being spent from person to person to infinity.....but it can't be in a debt money system like we have today.