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 Calories, Bad Calories "well-researched" and opines that Taubes’s conclusions are "somewhat startling yet surprisingly convincing." Journalism professor and food author Michael Pollan describes "Good Calories, Bad Calories" as "valuable" but believes that it "does not escape the confines of nutritionism." "New York Times" medical reporter Gina Kolata concluded that she was ultimately "not convinced" by Taubes’s arguments, writing that "the problem with a book like this one, which goes on and on in great detail […] is that it can be hard to know what has been left out." Laura Vanderkam reviewed the book somewhat negatively in "The American", the journal of the