HYPERINFLATION requires a good head for figures and a sturdy wallet to hold wads of low-value paper money. Goverments have attempted to keep pace with hyperinflation by issuing ever-higher denomination banknotes to replace worthless notes that might as well serve as wallpaper. Last week Zimbabwe's central bank unveiled a 100 billion dollar banknote to cope with inflation running at 2.2m%. On Sunday July 27th the bank changed tack and announced it would be lopping off a string of zeroes on replacement notes, in what passes for economic reform in stricken Zimbabwe. But Robert Mugabe has some way to go before he can claim for his country the accolade of printing the highest-denomination banknote. A note issued in post-war Hungary came with a mind-boggling 19 digits.

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