@ryo @TerminalAutism @digdeeper @udon People don't realize that anything can be used as a money. The ideal ancap society would probably use something like gold or silver (which cannot be created unless you can add/remove protons from atoms) for money or just use simple bartering in some cases. There will probably be parallel markets, each accepting their own money.
Money is just an extension of the barter system which seems to be innate within humans. Even primates barter food for services like picking lice.
And before anyone brings up "primitive communism" nonsense, hunter-gather societies didn't distribute goods "in each according to his need". Food was distributed on a borrowing or lending basis. Food was given only to those who would do something in return. People who worked more often earned more food and had more priority. So yeah, it was basically a barter system. They even bartered with other tribes.