You might have heard about the so-called Gresham's law, which states that bad money drives out good money, but this law only holds if there are price controls in effect, only if the exchange ratios of different monies are fixed and no longer reflect market forces. Is it the case that bad money drives out good money under normal circumstances without any interference? No, for money holds to exactly the same law that holds for every other good. Good goods drive out bad goods. Good money drives out bad money, so this bezant was for something like 800 years considered to be the best money available and was preferred by merchants from India to Rome to the Baltic Sea.