Application
The principles of Gresham's law can sometimes be applied to different fields of study. Gresham's law may be generally applied to any circumstance in which the "true" value of something is markedly different from the value people are required to accept, due to factors such as lack of information or governmental decree.
In the market for used cars, lemon automobiles (analogous to bad currency) will drive out the good cars. The problem is one of asymmetry of information. Sellers have a strong financial incentive to pass all used cars off as "good" cars, especially lemons. This makes it difficult to buy a good car at a fair price, as the buyer risks overpaying for a lemon. The result is that buyers will only pay the fair price of a lemon, so at least they reduce the risk of overpaying. High-quality cars tend to be pushed out of the market, because there is no good way to establish that they really are worth more. Certified pre-owned programs are an attempt to mitigate this problem by providing a warranty and other guarantees of quality. "The Market for Lemons" is a work that examines this problem in more detail. Some also use an explanation of Gresham's Law as "The more efficient you become, the less effective you get"; i.e. "when you try to go on the cheap, you will stop selling" or "the less you invest in your non-tangible services, the fewer sales you will get".
Vice President Spiro Agnew, used Gresham's law in describing American news media, stating that "Bad news drives out good news," although his argument was closer to that of a race to the bottom for higher ratings rather than over and undervaluing certain kinds of news.
Gresham's law has been cited as "Silver currency will inevitably force gold currency out of circulation" (L. Pyenson, Servants of Nature (W.W. Norton, 1999) p. 21); this suggests a fundamental misinterpretation, cf. Mundell (above).
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