Hyperinflation is the most extreme form of inflation. The most widely accepted definition of hyperinflation comes from Philip Cagan (1956), who set the threshold at 50% inflation per month. However, I modernized and operationalized hyperinflation measurements by using daily implied inflation rates, derived from changes in the black-market exchange rate.
To formalize and record events of hyperinflation, Nicholas Krus and I created a framework to identify all known cases of hyperinflations in history to identify the start and end dates of each episode, peak inflation rates, duration, policy triggers, and currency breakdowns. This dataset is the most reliable and definitive academic reference on the subject.
