Well certainly if you want to get away in a 65' mustang you'd want gold.
I think one thing that makes PM very attractive is the chance that the perceived supply is a lot higher than the actual supply. If that's the case the correction could be huge for people that have some physical.
2 other factors to consider (IMO) are
-what products are useful or you would need in the event of an economic breakdown and
-what products could be hard to get that people might really really want.
Although if you are way off, it might be easier to unload some PM as opposed to TP.
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