I very sincerely think that every conversation or speculation about the fiat economy is a complete waste of time.
All fiat money is imaginary. When banks write entries in ledgers, that action produces a mirage that looks like money. They issue debt that is physically impossible to pay back, since there was no value dealt in the first place. The whole thing is an imaginary, abstract simulation. You cannot model a fiat economy because it's no longer tethered to objective physical reality—you're just telling stories.