For 10 points, name this economic principle which states that bad money drives good money out of circulation.
One version of it was stated by Copernicus in his Monetae cudendae ratio, but it was given its current name by Henry Dunning Macleod. It was stated by its namesake in a letter to Queen Elizabeth, and it may only apply in countries with legal tender laws. Dollarization, in which the citizens of one country use foreign currency rather than their own, is an example of this law working in reverse. The widespread use of fiat money in modern economies could be considered an example of it, though it originally only concerned economies with two forms of commodity money. For 10 points, name this economic principle which states that bad money drives good money out of circulation.
One version of it was stated by Copernicus in his Monetae cudendae ratio, but it was given its current name by Henry Dunning Macleod.
{Gresham's} Law