circulation
流通 — Phenomena
Money going on passing from hand to hand.
Knife moneyWarring States period
Spade moneyWarring States period
Pegasos Stater of CorinthCirca 400–375 BC
⚠ If the same coin changes hands many times in a year, transactions can be sustained even with a small number of coins. Not just 'how much there is', but also 'how fast it circulates' is what matters.