Zimbabwe has been in a hyperinflation downward spiral for almost two decades now[1].
If you hold your Zimbabwe Dollars overnight, they are only worth a fraction of what they were the day before. In hyper-inflationary periods, people would rather buy goods immediately than hold onto cash because the cash depreciates FAR faster than commodities.
[1] https://en.wikipedia.org/wiki/Hyperinflation_in_Zimbabwe#/me...