 Oresme also stated that in a society in which two currencies with the same designation but of different value circulate, the money of lower value drives out the money of higher value. This economic law was also discovered independently of Oresme by Nicolaus Copernicus (1473–1543), the famous astronomer, who wrote about a reform of the Prussian coinage, and by Thomas Gresham (1519–1597). Today it is called Gresham’s Law, or sometimes the Law of Oresme, Copernicus, and Gresham, but its oldest version can be found in Aristophanes’s poem ‘The Frogs’ (Balch 1908; Sparavigna 2014).