Money on Mars

Colonies trading on Mars are going to use water as money.

In olden days coins played a far smaller part in commerce than they do to-day. Indeed so small was the quantity of coins, that they did not even suffice for the needs of the Medieval English Royal household and estates which regularly used tokens of various kinds for the purpose of making small payments. So unimportant indeed was the coinage that sometimes Kings did not hesitate to call it all in for re-minting and re-issue and still commerce went on just the same.

after the collapse of the Roman Empire, and then again after the Carolingian Empire likewise fell apart, this seems to be what happened. People continued keeping accounts in the old imperial currency, even if they were no longer using coins.

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