People with a bunch of cool stuff decided they wanted a bunch of gold, when other people found out, they found it was a relatively convenient thing to carry around because you could trade a little gold to anyone interested in it for a lot of other stuff, it was easy to work with and break apart, and didn’t tarnish or go bad.
The demand for gold was consistently high enough that even if you didn’t want gold personally you probably knew someone you could trade it to for what you wanted, and as people used it more, it became established roughly what an amount of gold could get you, making it easier to figure out how fair any given trade was.
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