In the early 1920s, Ludwig von Mises became a witness to hyperinflation in Austria and Germany — monetary developments that caused irreparable and (in the German case) cataclysmic damage to civilization.
Mises's policy advice was instrumental in helping to stop hyperinflation in Austria in 1922. In his Memoirs, however, he expressed the view that his instruction — halting the printing press — was heeded too late: (more)