Ultimately, it all comes down to raw materials and similar resources, and all those will be claimed by people with lots of real money. Your "invented ... other money" will be useless to buy that fundamental stuff. At best, it will be useful for trading scrap and other junk among the unemployed.
> In reality, if there really is mass unemployment, AI driven automation will make consumables so cheap that anyone will be able to buy it.
No. Why would the people who own that automation want to waste their resources producing consumer goods for people with nothing to give them in return?