A gets bread from B, but A has nothing B wants, so A gives B money.
B then gives the money to C for a shirt.
The shirt pays B for the bread.
A complete money transaction is always three people, not one, not two, but three.
Money cannot do its job accurately without a standard of price that A, B, and C all understand.
By extension to everyone using that money, the standard must be one that everyone understands and uses.
In other words, good money communicates equal trade.
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