Quote from Lights:
For the umpeenth time, Gold isn't a currency. Gold COINS have been currency in the past. but Gold as a commodity is not money as paper pulp isn't and so isn't copper and zinc which they strike into pennies and quarters!
Gold is a commodity and a store of wealth to carry over across death and war. If food didn't spoil, it'd be a store of wealth as well. Any commodity is as long as it doesn't spoil
And that's the whole miscommunication between gold bears and gold bulls, the bears always chart gold against the USD because they treat it only as a commodity as it isn't legal tender, the bulls look at the same chart the other way around and see the USD against gold because when it takes too many dollars to buy the basic necessities people will use gold as an medium of exchange even if it isn't legal tender. Only difference now is before people would carry barrels of cash to buy a loaf of bread but with technology a barrel of cash can be replaced with plastic cards.