It's prone to boom and bust which has been devastating. Hayek describes a type of money that adjusts it's supply to maintain a stable price. Until now this wasn't technically possible. Ampleforth.org is an interesting experiment to introduce a new base reserve with dynamic supply and eventually a stable price. https://m.youtube.com/watch?v=9-uo-KfnkhI
Economies boom and bust. This has nothing to do with fiat currency, and is a heck of lot better then the alternative where shopkeepers and employees are made poorer due to economic prosperity because they don't adjust their prices fast enough.
