I still haven't figured out that when the world goes to hell and paper money becomes worthless, who is going to be buying all this gold and what will they be buying it with? That gets me back to my baked beans analogy of 4-years ago.
It's really quite simple gold, silver, copper and other commodities will be used, traded or bartered for goods that are needed. Historically commodities have always been utilized as money for trade purposes.
So what we come around to is we need a noncorroding useful asset that also does not spoil or need any care in storage that could be used for barter. Bullets could work but there are so many different calibers to cover and they can even get pretty fuggly if not stored in a conditioned climate.
So the war has started and we're all dug in till it's passed or over..... Yea right but have you considered the thermonuclear bomb that exploded far enough away that you survived the blast... But the radiation levels will shortly kill you if you don't quickly pack up and move to a safer area.
This is where gold and silver will show it's worth. A person ain't packing along enough lead to utilize as barter as needed but one could manage to take along enough precious metals that could make the difference between life and death.