Currency

Likely the players who want to design all the tech, including toothbrushes, would also want to name their own currency.

I think the default should be something quite neutral like “credits” or just “currency”. Before money is invented the monetary unit would have the name of whatever the people use as a hold of value (for example squirrel skins).

Basically all currencies nowadays are fiat money:

A good example of something that fulfills these criteria, are bottlecaps in the fallout universe. They are rare enough and more cannot be manufactured as the technology is lost, so they can retain value by not being too abundant, not being really useful for much and they are easy to transport.

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