Do some currencies hyper-inflate? Sure do, and then they correct and recover.
Many don't recover. they are dead forever. Confederate dollars, for example.
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Or the Reichsmark, etc.
But did the underlying economy, people, families, businesses just disappear with them? No. They just started using a different currency.
That's why I don't care at all what happens to the Dollar, the Euro, whatever. Doesn't fucking matter. Life goes on. Cycles happen. Humanity learns, grows.
And we don't need an alternative currency run by a bunch of amateurs to do it.