Iwouldt give you a can of pork and beans for an ounce of gold it shtf.
The purpose of currency is storing value. You might trade that can of beans for a chicken or something and so on, and so on. Eventually people will need to trade in another medium so you could buy a cow without having to find a cow's worth of goods the farmer wants. The low level barter has a lot of friction, silver decreases this.
gold and silver is for preserving wealth, If your rich enough to have everything else you need.
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