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There is not even remotely enough silver & gold coinage in existence with which to run even a subsistence level economy. And govts don’t have enough gold & silver tucked away to make it actually exchangeable for paper money. Gold-backed paper money would not be anything more than a feel good exercise in which everyone pretends to believe the paper money is actually backed by gold. However much gold govts need to have sitting in vaults to back their currency is how much they will say they have and there won’t be any way to verify it.