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,
Bad Girl Good Girl debut performance on July 1, 2010, with "Bad Girl Good Girl" on M.net M! Countdown. They were number one for the first time on M! Countdown on July 22. Miss A became number one again on KBS Music Bank the following day on July 23 and on SBS Inkigayo on August 1. "Bad Girl Good Girl" was awarded Song Of The Month on Cyworld, one of the biggest Korean music portals. Bad Girl Good Girl "Bad Girl Good Girl" is a song recorded by K-pop girl group Miss A for their debut EP "Bad But Good". The song served as