Monetae cudendae ratio ("Treatise on Coin") and "Modus cudendi monetam" ("The Way to Strike Coin"). He made these the basis of a report which he presented to the Prussian Diet at Grudziądz (Graudenz) in 1522; Copernicus' friend Tiedemann Giese accompanied him on the trip to Graudenz. For the 1528 Prussian Diet, Copernicus wrote an expanded version of this paper, "Monetae cudendae ratio", setting forth a general theory of money. In the paper, Copernicus postulated the principle that "bad money drives out good", which later came to be referred to as Gresham's Law after a later describer, Sir Thomas Gresham. This phenomenon had been
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