The point is you need both day to day goods, and bribery goods, for when things go bad. IMHO, in modern context, that would mean consumables like batteries and status items like high end personal electronics. A couple boxes of 5.56 and some rotgut is going to be of limited value.
I would suspect that if things like high end personal electronics still had value, then so would gold. I'm no goldbug and in fact have sold most of my gold coins, but if you're interested in trade goods, gold coins are a lot more fungible, negotiable, and easier to store, transport and protect than electronics, consumables or luxuries. But you can never really know in advance.