It’s “stable” because the element itself is rather stable. It won’t rust, decay, wear down, get broken, etc. 500g of gold then (if preserved or kept carefully) will be 500g of gold in 100 years. And it’s rare enough that people ascribe a high value to it. And it’s useful enough so it will retain value intrinsically (gold for electronics for example). It’s relatively easy to manage, melt, and form into other forms. But it’s plenty enough that people can (and have had) use it as a currency (vs other rare metals like platinum or titanium).
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