I've always been fascinated by hyperinflation. It's a morbid sort of fascination, like slowing down and staring at a really bad traffic accident. Some time ago, I discovered a table of hyperinflation episodes in the modern age, titled The Hanke-Krus Hyperinflation Table
So, naturally, I wanted to see the absolute highest rate of hyperinflation ever recorded.
Here it is ---
In Hungary, in July 1946, the inflation rate hit 4.19 x 10^16 % per month
That's 41,900,000,000,000,000 % per month (41.9 quadrillion percent per month)
The equivalent annual rate of inflation in that fateful month cannot even be calculated on a typical scientific calculator, because the result is beyond 10^99 (the limit on most calculators).
But, that equivalent annual rate would be meaningless, in any event -- once hyperinflation reaches its climax, it cannot continue for even another month, let alone for a year. When the climax is reached, the currency collapses, potentially taking the government and the entire society with it.
At the height of the Hungarian hyperinflation, the DAILY rate of inflation was 207% ---
--- and prices were DOUBLING every 15 hours.