Medium of exchange was observed as early as Oresme, Copernicus and then in 1558 by Sir Thomas Gresham, that bad money drives out good in any marketplace (Gresham's Law states "Where legal tender laws exist, bad money drives out good money"). A more precise definition is this: "A currency that is artificially overvalued by law will drive out of circulation a currency that is artificially undervalued by that law." Gresham's law is therefore a specific application of the general law of price controls. A common explanation is that people will always keep the less adultered, less clipped, sweated, less filed, less trimmed coin,
Hard cases make bad law received special attention as the recipient of more care. The legal scholar Arthur Linton Corbin, writing in 1923, reversed the adage in an article entitled "Hard Cases Make Good Law": Hard cases make bad law Hard cases make bad law is an adage or legal maxim. The phrase means that an extreme case is a poor basis for a general law that would cover a wider range of less extreme cases. In other words, a general law is better drafted for the average circumstance as this will be more common. The original meaning of the phrase concerned cases in which