Or I should have referred to the Zimbabwe currency... The Zimbabwe Dollar would be a perfect example. It hasn't been a currency for a decade now and ceased bei

Or I should have referred to the Zimbabwe currency... The Zimbabwe Dollar would be a perfect example. It hasn't been a currency for a decade now and ceased being used as currency many years before that, precisely because it was so unstable. Once official currencies stop being used as currency (first unofficially and then officially) all the time if they don't behave in ways people expect currency to behave.