In July 1932, deep in the Depression, the Tyrolean town of Wörgl began paying for public works in notes of its own.
Its mayor, Michael Unterguggenberger, followed the economist Silvio Gesell: at the end of every month, whoever held a note had to buy a stamp worth 1% of its value to keep it valid.
Nobody wanted to be holding one when the month ran out, so the notes kept moving, and the town built houses, a reservoir, a ski jump and a bridge with them. Austria's central bank shut the scheme down in September 1933.