See also Will Ruddick (Grassroots Economics) on 'demurrage' - Shillings from Heaven / Wörgl's Miracle ( https://grassrootseconomics.org/worgl ) - (film youtube link: https://www.youtube.com/watch?v=6Uz4PRWr3ns )
The movie references the book Silvio Gesell - The Natural Economic Order - https://en.wikipedia.org/wiki/The_Natural_Economic_Order