I think 'gold' because it has historically been used as currency throughout the world. When a king said "look at me..I'm a king with wealth" he wasn't showing off paper currency, he had chests/rooms of gold and other precious metal/stones.
Now if you are talking a complete breakdown of society..then yeah, gold is mud. You need canned food, water, ammo...etc to have any 'wealth'. If you are talking strictly a monetary collapse, where the US dollar becomes worthless, other countries should still value gold as a financial commodity.
My .02
As a druid-elf, I don't value money. My people value food/water/shelter/and leather pants.
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