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 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 the group's debut single in July 2010. "Bad Girl Good Girl" became an instant commercial success in South Korea, topping the Gaon Digital Chart. On July 1, 2010, both "Bad Girl Good Girl" and their first EP "Bad But Good" were released. On June 30, 2010, the music video for the song was released online. The music video features the girls in a school, dancing in sync. The group had their