Realistically, if a couple rich people ever obtain all the money, they no longer have any, because money only has the trait of being money and not merely some piece of metal or paper or information or whatever else when it is used as a medium of exchange, and if almost nobody actually has any, then exchanging it on a meaningful scale is no longer possible.
Huh
Summary
T.J. discovers that while he was out sick, the school has undergone a currency implementation, “Monstickers.” It would now require an X amount of Monstickers to do anything that was free at recess before that point. At first, T.J. is broke, but through hard work and investments, he becomes the richest kid in school and grows mad with power and greed and even loses his friends in the process.
Huh
https://antifandom.com/recess/wiki/Economics_of_Recess