Unless you can hunt ..fish.. forage for food ..and filter water ..you are probably screwed.
also, must be prepared to shoot someone who tries to raid your vegetable garden.
Also, vices (sugar,tobacky,booze) will be worth more than gold.
I shall tell mt wife that I’m investing…that’s the ticket.
No. They won't.
Because all of those things are very easy to make or grow.
Sugar can be made from sugar beets with a grater, pot and cloth bag, tobacco can be grown in the warmer areas and booze is so easy to make a caveman can and could do it.
Caffeine is going to be the thing people crave and will find hard to get.
Not many plants with Caffeine in areas that are not sub tropical.