This is one of the most absurd tropes in capitalist societies where you literally need money just to exist. No only that, but money literally buys happiness because you can pay other people money to do things you don't want to do, and that frees your time to spend on things you enjoy doing.
Yeah, iirc money very much does correlate with happiness until a certain point. The relationship breaks down once people have enough to meet their needs/reasonable wants, so 'infinite money doesn't buy infinite happiness' might be a better phrase.
(Disclaimer: I'm going off some study I read yeeaaars ago.)
Prove it. Give me infinite money. I’ll make this sacrifice FOR SCIENCE.
I also volunteer for this experiment.