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. See also Adverse selection Free silver Inflation Junk silver, coins collected specifically for the value of their silver content Lemon socialism List of eponymous laws List of multiple discoveries Metal theft Penny debate in the United States Seigniorage Worse is better Notes References Armitage, Angus, The World of Copernicus, New York, Mentor Books, 1951. Bernholz, Peter and Gersbach, Hans, "Gresham's Law: Theory." The New Palgrave Dictionary of Money and Finance, vol. 2. Macmillan: London and Basingstoke 1992, 286–288. Bush, Vannevar, (1950) Science, the Endless Frontier, Report from the Director of the OSRD to President H. Truman Guidotti, P. E., & Rodriguez, C. A. (1992). Dollarization in Latin America – Gresham law in reverse. International Monetary Fund Staff Papers, 39, 518–544. Rothbard, M.N. (1980). What Has Government Done to Our Money? Gresham's Law and Coinage von Mises Institute. Selgin, G., University of Georgia (2003). Gresham's Law. External links Gresham's Law by George Selgin (archived 21 February 2012) Multi-language translation of Nicolaus Copernicus, Monete Cudende Ratio Coinflation.com – illustrates Gresham's Law based upon the current metal value of coins in circulation. Adages Monetary policy Economics laws Eponyms Metallism International trade theory Nicolaus Copernicus 1858 in economics