I don’t know the answer to that, I was just thinking out loud.
I am not sure the answer is clear, because in the event of a collapse and there was still a fractured market, how does gold get reintroduced as a medium of exchange? Most people do not have it and prices will need to stabilize before a standard can be naturally formed. I hope to never have to learn those answers firsthand.
The idea is to have some gold physically in your possession. That way, you have something compact, tangible — that EVERYBODY wants, just in case somebody has some commodity you need. With gold, you can buy it. Without gold, you’ll have to beg after you run out of things to barter.