uhhh if there was a nuclear war or natural disaster no one would give shit about currency, it's about food and guns, I will shoot you and take your gold.
Read any economic dystopian collapses, people traded there gold for Bic Lighters and ammunition.
why the gold? i'll take directly your foods and everything else, if i'm starving, gold would be useless at that point, only foods and water would matter
and girls for fun activity, if you know what i mean...