[crote]

Currencies rarely "go away". They are usually replaced by new ones, and the government will buy the old currency and pay you in new currency. Imagine the mayhem if a government decided that all money everyone owned would suddenly be completely worthless!

[evanb]

In 2016 India demonetized some bank notes (true, not the whole currency)

https://en.wikipedia.org/wiki/2016_Indian_banknote_demonetis...