>depending on what you’re talking about?
Prices going up when the money in peoples' pockets is not.
>money is only a signifier.
I agree, signifies how rich or poor you are, as an individual or a nation.
Not the numeric amount, but what it will buy instead.
>that’s economic collapse. In such cases the amount of money in people’s bank accounts could remain constant
That would be true sooner or later even for those who rapidly decline to zero, think about those to which it would not have happened otherwise. Not to mention so many citizens not having a viable bank account to begin with these days.
By that definition those unfortunates would be suffering much worse than an "economic collapse", and there is great likelihood they would be overlooked until it is too late because everyone else has it so much worse-than-before themselves. Trump is not even as honest as Nixon, there's going to be a lot more businesses and families ruined before this is over. In times of triage for survival, only so many can be saved, and it can be kind of a crap shoot.
>Falling prices would be deflation
Got it. So rising prices are inflation.
IOW whatever it is beyond your control that makes it more difficult or impossible to afford what you once could. Or what was once almost within reach but can no longer be sure it's even on the horizon any more.
Got it. Not really the amount of money in "circulation", but what people are actually able to buy with it. Especially compared to what it was "before inflation".
People generally always figured this anyway, lots of them are not easy to fool.
Regardless of any fancy equations.