Thanks for the link. Interesting.
As an aside, I always wonder when gold adverts say it is easy to buy and easy to sell and has never been worth zero, if money crashes who will have something with which to buy the gold you have easily accumulated.
Metals become virtual paper weights, regardless of their color.Gold. silver, copper. After a dollar or currency crash, industry crashes too so not even industries will have much of a demand to maintain high prices.
Gold always has value.