Daily inflation rate: 207 percent
Prices doubled every: 15 hours
Story: Hungary was economically devastated by WWII. Owing to its unfortunate status as a warzone, estimates indicate 40 percent of Hungary's capital stock was destroyed in the conflict. Before this, it had engaged in a wild, debt-fueled ramp up in production to support the German war effort, but Germany never paid for the goods.
When Hungary signed a peace treaty with the Allies in 1945, it was ordered to pay the Soviets massive reparations, which accounted for 25-50 percent of Hungary's budget during its hyperinflationary episode. Meanwhile, the country's monetary policy was essentially co-opted by the Allied Control Commission.
Hungarian central bankers warned that printing money to pay the bills would not end well, but "the Soviets, who dominated the Commission, turned a deaf ear to these warnings, which led some to conclude that the hyperinflation was designed to achieve a political objective–the destruction of the middle class" (Bomberger and Makinen 1983).
Sources: Hanke and Crus (2012), Bomberger and Makinen (1983)