iCEBREAKER, I suspect we're working under conflicting definitions.
It's not just age and history. Silver, gems, and seashells were used long before gold, yet are now demonetized.
If silver is "demonetized", so is gold. Seashells ain't scarce anymore, and historically were used by cultures that got physically steamrolled later (so their cultural norms didn't control). Gems ain't fungible
or scarce.
Gold's unique properties, which create its unparalleled inherent utility, are not "bizarre" or a "self-fulfilling prophecy."
Which properties do you mean? Is it just the scarcity/fungibility/divisibility trifecta? Because it seems to me like, to some extent, those are required for something to function as money at all.
The backing process must end somewhere; it cannot be turtles all the way down.
The only way to stop the infinite regression is with a self-backing money of intrinsic value.
Disagree, although that's possibly because we're using different definitions of "backing".
To me, "backing" is one source of confidence in a currency's future value - that it is guaranteed by some trusted authority to be exchangeable 1:1 for some good that's already considered valuable. So, silver certificates are backed by silver, because silver is already considered valuable and the government promises to give you silver if you turn in a silver certificate. Liberty Reserve was backed by gold because NotHaus promised that you could redeem them for gold in his Idaho warehouse. You could even say that stock ETFs are backed by their stock basket.
But currency confidence can come from other sources. USD, for example, functions as a currency because it's fungible, divisible, and (relatively) scarce, and people are confident they can buy stuff with it tomorrow. It's not "backed" by anything, other than, perhaps, anti-debt (that is, the government guarantee that if you are in debt, including tax debt, you can throw dollars at the debt to extinguish it). But people have confidence in its buying power (out of habit, the presence of an established economy, and if nothing else, tax obligations), so they use it and it works.
Gold's got scarcity, divisibility, and fungibility, and people are confident it'll still be worth a lot tomorrow. Why are they confident it'll still be worth a lot tomorrow? Because it's been worth a lot for as long as anyone can remember, because the scarcity is defined by physical law, because culturally we think of gold as a symbol of wealth, and because it has some (niche) practical use that would make it useful even without its monetary properties. But I'd argue that those non-monetary practical uses constitute only a small portion of what makes it valuable in the eyes of people in general. It's mostly psychological, cultural, and based on its history of past value.