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They aren't fully separable, but no one is claiming they are.
Ultimately, a currency that fails to be a SoV will fail to function as a medium of exchange, because of the point you make: we accept something as MoE because it's value stores long enough to exchange it for something else of similar value.
As you say, it only functions within a limited span of time, but money tends to be spent if it isn't worth saving.
we accept something as MoE because it's value stores long enough to exchange it for something else of similar value.
hm... I don't actually think it matters. Both equilibria work:
- produce for money, hold money the PP of which appreciates (like bitcoin) or stays the same (like gold), exchange money for other goods/services.
- produce for money, pay bills and consume in same time period, shove surplus into gold/bitcoin/stocks, exchange gold/bitcoin/stocks for other goods/services in the future.
I can see pros and cons of both those scenarios, but it's not obvious that, like @CliffBadger claims, either of them "fail" as money. They're both facilitating trade, doing money's role.
shove surplus into gold/bitcoin/stocks
That's just one version of the subsequent exchange that I'm talking about though. If the value were falling so quickly that you couldn't get a sufficient amount of gold/bitcoin/stocks, then people would stop using the currency as a MoE.
Yes-ish... Historical record doesn't bear that out. We keep using money weeeeelll into hyperinflation. It certainly fulfils this role in the Western world, covid inflation aside
I can't argue that people don't give up on their failing fiat as quickly as one might expect
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No, they continue to trade it but faster and faster — hot potato style. Velocity up, etc, cuz on the margin it's more costly for you to hold cash
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That's sort of your value judgement.
You look up the definition of money, what you outlined as fiat fits that.
So, I disagree with your method/component but agree with your conclusion that it's a manufactured obstacle
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