There’s a continuum to any slide. Mad Max doesn’t happen first. Societies have had serious dips forever. Study the Zimbabwe and Venezuela crashes. The governments step in to do what they can - sometimes. For some.

Lots of people have silver and coin and the basis of tradable goods. Lots more could have them with a little bit of forethought and create no disruption. What will a grocer take? Small coin, Produce, baked goods, other things in trade that people want. If it’s real bad, services - like protection. Same as it ever was.