Attaching the value of a fiat currency to something is very unstable in the long run. This is independent of if what it is attached to, be it gold or another fi

Attaching the value of a fiat currency to something is very unstable in the long run. This is independent of if what it is attached to, be it gold or another fiat currency. Imbalances will simply pile up over time and doom it to fail. This can be exemplified by your examples, but also by the currencies going off the gold standard during the Great Depression.