Historically not the case for most RW civilizations. They were quite
happy to accept
foreign currency of proven worth. For example, the Mexican Silver
Dollar was widely
traded in Ming and Manchu China while Roman coins were used in India. Greek
cities continued to produce their own currency under Roman Imperial rule.
Another consideration is that due to straited circumstances, the
state currency
may be so debased that the tax collectors refuse to accept it.
Lastly there's a unit of exchange which hasn't been mentioned so far: ounces of (gold or silver) dust. Simple and widely accepted.
--Peter Metcalfe
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