“…We thank Arthur Fishman, Angela Redish, Thomas Sargent, Theodosios Temzelides, and seminar participants at the Federal Reserve Banks of Minneapolis and Philadelphia, the Penn Macro Lunch Group, the Universities of Chicago, Essex, Cambridge and Haifa, and the 1996 SEDC conference in Mexico City.1 Moreover, its empirical validity is questionable, or at least seems to depend on circumstances. Laughlin (1903,, describes a variety of instances in which Gresham's Law appears to work, while Rolnick and Weber (1986) describe several examples that seem to violate it, although Greenfield and Rockoff (1995) dispute these examples. De Roover (1949, 93) discusses the misattribution of the Law to the 16th century English banker Thomas Gresham, and remarks: "Gresham, consequently, does not state that bad money necessarily drives out good.…”