I think, I broke Perplexity by asking when, in human history, a society switched from a fiat standard to a hard or sound money standard. Even though I said that nothing after 1971 counts, because then the whole world transitioned to the fiat standard, and Perplexity accepts that, it could not provide me with a single historical occurrence before 1971 where such a thing happened.

Except this one:

"Diocletian's Reforms in the Roman Empire: In 301 AD, Emperor Diocletian introduced reforms aimed at stabilizing the Roman economy by introducing the solidus, a gold coin that was 99% pure."

After that, it kept repeating some South American societies binding their money to the USD after 1971.

So: Will Bitcoin really replace or abolish the money printers in near future? That would indeed be a historical event.

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The mediterranilean societis did that. When Mediterranean societies came under Islamic rule in the 7th century, significant changes occurred in their monetary systems. The Umayyad Caliph Abd al-Malik (685–705) introduced reforms that replaced the earlier Byzantine-Roman coinage with purely Islamic coins, such as the gold dinar and silver dirham.

The Roman coinage, including copper-diluted fiat coins, was gradually phased out in favor of gold and silver-based Islamic currency.

Right, but that was due to a complete cultural and population change. The Muslims just kept using the money they used before in their earlier home territories. The Romans themselves didn't go back to hard money.

There was no population change. The majority stayed christian and communities were not expelled. The islamic way of doing sound money trade took over many parts of the world that way.

Yes, by rule of a different society. Question was when "a society switched from a fiat standard to a hard or sound money standard" the last time. The intention behind a this question was to find out, if a people has ever become reasonable on its own and switched back to sound money, without being conquered or dominated by another culture. And behind that lies the question of how likely it is that we in the West will ever experience a Bitcoin standard.

What i am trying to say: When societies accepted new rulers it often reflected their preference for systems offering more stability, freedom, and prosperity. Societies embraced islamic rule (and kept their own language and religion for centuries) for its ability to give rhem a better life.

While the religious aspect of Islamic expansion is often emphasized, the technical aspects are neglected. Islam was not solely a religious phenomenon but also a socio-economic transformation driven by practical benefits.

Regarding the question of whether "people become reasonable on their own," I believe that external catalysts are almost always necessary to inspire change and shift attitudes. Societies that remain closed off and resistant to outside influences are often the first to stagnate and decay.