Possible - yes --- only if the planet was about to die and hence nobody gave value to anything except their last breath.
Probable - I think not.
The chances that every single thing on an exchange would be worth zero ------ hmmmmm - That would be the day that humans valued nothing!
Well, it hasn't happened yet in history or prehistory as far as I know. I don't think it is about to start now.
We may have a collapse in monetary systems and we may not. We may have depressions and we may not. But as always, things (natural and man made) will be of value.
There is far more chance of people valuing things so much that they fight for them as opposed to having orderly trade in them.
Now, this, we have the form for, even over things that in retrospect, were not worth fighting for.
The current cycle is not about the value of 'things' - it is just about how we pay for them and who owns them.
