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Thommo wrote:

Evolving wrote:Good points; and I'll admit that I wasn't thinking of bitcoin, but about a worldwide fiat currency run by a worldwide central bank.

With good reason I suspect, as fiat is really the only game in town right now.

If it ever happens that there becomes a single currency for the whole world, I think it will happen overnight so to speak, because of an economic catastrophe.

Thommo is right to say that fiat currency with the $ as the world's reserve currency has had a good innings, but with the national debt at about 130% of GDP and generally trending higher, combined with a current treasury/bond (debt) market sell-off and high inflation with nothing but a recession on the cards, that catastrophe looks very probable to me.