To act as a good currency, the currency should be almost worthless (or worth a lot less than the value it represents). USD and Bitcoin are both good currencies

To act as a good currency, the currency should be almost worthless (or worth a lot less than the value it represents). USD and Bitcoin are both good currencies, in part because they are worthless. To flip it on it's head - if a currency is worth more than the value it represents then no one would spend anything.