Granted, the Wikipedia definition in your link does appear to be based only on fiat currencies.

And your last statement is a fair point, from the point of view of how one might profit from Bitcoin.

But the monetary theory of Bitcoin is not about making profit, it is about creating non-fiat currencies.

And in that, it has had some success, evidenced by the plethora of non-fiat currencies which now exist, using the general principles of distributed ledger it made famous.

The definition of modern monetary theory in Wikipedia looks like a great example of established knowledge ignoring the presence of new knowledge.

Solarpunk

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