Money as something corporeal is represented in coins and banknotes, which the legislator defines to be legal payment. They are fungible goods and therefore it is necessary to have regard to the principles of the law of property for their transfer. It is impossible for there to be more coins and banknotes than the legal authorities (the government is responsible for coins, the central bank is responsible for notes) have issued into circulation; were it to be more, it would be counterfeit money.