"When J.S.G. Boggs needs money, he draws it. He draws one side
of a banknote on high-quality paper, actual size, and presents it
to the merchant.
"The merchant, knowing that the banknote is not official, can
accept it or ask for real cash. If the merchant accepts it, Boggs
writes the details of the transaction on the back, asks for proper
change, and gets a receipt..."