Whose law states that 'bad money drives out good'?

Asiotye, So please explain what it is about because I was interested in the explanation.

Good money, say a gold or silver coin with nominal value close to the value of the metal, will be displaced, in the common currency, by bad money/Fiat money, money whose value is derived by government guarantee. I chose Rothbard, because he was an economist from the Austrian school.

It was Copernicus who said it first.