[Southack]

"Every textbook discussion of currency that I've ever seen always lists "a store of wealth" as one of 3 primary functions of currency. When did this change?"

...With the advent of government-issued paper currencies.

[OwenKellogg]

My question: "Every textbook discussion of currency that I've ever seen always lists "a store of wealth" as one of 3 primary functions of currency. When did this change?"

Your answer: ...With the advent of government-issued paper currencies.

Discussion: it is impossible to change the function of currency with the advent of currency.

Or did you intend to imply that currency is no longer a store of wealth with the advent of fiat currency? In that case I agree. But Friedman and the Austrians still maintain that currency should serve as a store of value. Are they off base?