What do you say an investment is, what "investment" means in a financial context, then we can consider whether gold is an investment. — tim wood

An investment is something you purchase not to make use of, but with the hope it will make you money passively, just by owning it. This can come from appreciation in price over time, or from income in the form or rent or dividends, or both.

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From a little bit of searching, I'm satisfied - and surprised - that the words themselves are so loosely defined and used that no argument over just the words can prosper either side — tim wood

Really all that needs be said.

But are cryptocurrencies truly scarse at all? — hypericin

They range from supplies of 1 to (theoretical) supplies of infinity.