[charlesdm]

I'm not sure I believe that. If civilization were to collapse, you'd want food, medicine, potentially gas. Potentially solar cells, and some other things.

I think you'd see more traditional bartering than money being introduced again in its earliest stages.

[fjsolwmv]

The problem with bartering is that useful but rare products are a poor store of value because peot need to use those things. Useless but rare things are better as money, as long a users are confident that there is economic growth to spend money on (decoupling consumption from production)