[librvf]

When it hits all of:

    Acceptability
    Durability
    Divisibility
    Stability
    Portability
    (Elasticity)

If you can't spend it easily, it's not a (functioning) currency.

If it spoils or decays within your lifetime it's not a currency.

If it's not something you can divide in order to make payments of a more-or-less arbitrary amount, it's not a currency.

If you can't predict how much of the asset you will need to pay your bills next month, it's not a currency

If you can't bring it with you to the place where the exchange takes place, it's not a currency.

If you can't obtain capital investment in a currency because the currency itself is more valuable than anything you could produce, then it's not a (good long term) currency. This last one is in parens because it one only matters in a growing economy. A deflationary currency can still otherwise function as a viable medium of exchange, but eventually, lack of availability for new entrants will mean that entrepreneurs will begin looking to do business in alternate currencies.

[cesarb]

> If you can't predict how much of the asset you will need to pay your bills next month, it's not a currency

Back in the hyperinflation days, we couldn't predict how many Cr$ we would need to pay our bills in the next month. That didn't keep it from being a currency.

[librvf]

That period did not last. Yes, if you try hard enough and look narrowly enough you can find exceptions to any of these rules, but it holds as a general guideline. If hyperinflation had continued indefinitely, it's probable some other commodity would have supplanted it as a de facto currency.

[blueprint]

Are you missing fungibility or is that covered?

[librvf]

Missed it. In my mind I think I lumped it in with divisibility, which is related but not quite the same thing.

[blueprint]

Nice. In that case, I wonder if you've ever heard of Monero? :)