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,
Good Girl Gone Bad beats bury her personality, and the summery reggae of her first two albums is sorely missed." Robert Christgau of MSN Music cited "Umbrella" as a "choice cut", indicating "a good song on an album that isn't worth your time or money". At the 2008 Grammy Awards ceremony, "Good Girl Gone Bad" received seven Grammy Awards nominations, including Record of the Year and Song of the Year for "Umbrella", Best Dance Recording for "Don't Stop the Music", Best R&B Performance by a Duo or Group with Vocals and Best R&B Song for "Hate That I Love You". It won the accolade