Gresham's law the creditor must accept such money at face value. Nobel Prize winner Robert Mundell believes that Gresham's Law could be more accurately rendered, taking care of the reverse, if it were expressed as "Bad money drives out good "if they exchange for the same price"." The reverse of Gresham's Law, that good money drives out bad money whenever the bad money becomes nearly worthless, has been named "Thiers' law" by economist Peter Bernholz in honor of French politician and historian Adolphe Thiers. "Thiers' Law will only operate later [in the inflation] when the increase of the new flexible exchange rate
Good Girl Gone Bad and the Universal Music Group respectively. "Good Girl Gone Bad" received generally favorable reviews from music critics. At Metacritic, which assigns a normalized rating out of 100 to reviews from mainstream critics, the album received an average score of 72 based on 17 reviews. "Uncut" called it a "shiny, trans-atlantic blend of Europop vim, R&B grit and Caribbean bounce." Andy Kellman of AllMusic deemed it quintessential pop music and said each of its tracks was a potential hit. Quentin B. Huff of PopMatters praised the album, describing it as "more raw, perhaps edgier and more risqué" than Rihanna's previous material.