Decius Ducats is the programme promoting the knowledge of economy, history and numismatics addressed to primary school, grade 4-6 pupils and teachers from the Małopolska Province. Among its main themes are selected issues relating to history of money from the ancient to contemporary times; from the value and role of money through monetary policy to numismatics. Some of the classes are devoted to the presentation of Nicolaus Copernicus and Justus Decius, the authors of the leading Renaissance treatises on economy in dispute on the monetary policy of the time.