This idea just popped in my head...I frankly think it's pretty stupid, but might make for an interesting conversation. I thought I'd throw it out there and see if it piqued anyone else's interest. What if we had negative money. For example, a $-2 dollar coin. So, if you owed someone two dollars, that person could just give you a $-2 dollar coin. Obviously, this turns the entire basis for a monetary system on its head, which is why I thought it was interesting...The idea that you profit by giving people currency, instead of by receiving it. ...And think of it being backed by a standard. What would be the standard for negative money? Enron/WorldCom stock? The plague? Subsaharan Africa?