Nothing has value until somebody wants to buy it (and no great value unless everyone needs it) . Compare the same house in Detroit Michigan to one in California or close to NYC. Currency is just a convenient form of trade material that is accepted globally but rises and falls due to a million factors.
Scrap metal is worthless in a way because you can't eat it or make anything useful with it (as an individual). Only when you trade it in does it go to the refinery to made into something useful again. If those large refineries suddenly disappeared those metals would be worthless as nobody could do anything with them.
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