What Would Happen To Monetary Currency Under Proposed Systems Of Anarchy?

Currency is necessary for a variety of reasons, and groups would get together to form currency unions. I suspect that no matter what happened, in no matter what circumstance, the group that managed to to this best at scale would displace all but a few of the other groups, and that we would once again return to a ‘state’ currency, if not a monopoly currency.  And I suspect those multiple currencies would be precious metals and paper money just like today. https://www.quora.com/What-would-happen-to-monetary-currency-under-proposed-systems-of-anarchy