it's not that the market can't continue to grow forever. there is no gravity in the stock market; these numbers have no upper limit. in theory, there is no reason why the market can't keep going up and up and up...

it's that money has to be created in order to be invested.

so, if you want this perpetually rising market? it's entirely plausible, and we know how to do it: the feds have to print. lots.

but, if the feds stop printing? then the market eventually crashes. that's when it can't keep rising...