Do you think people would no longer be incentivized if there were, for example, a cap on how much money/wealth they could own? Let's say the limit was $1 billi

Do you think people would no longer be incentivized if there were, for example, a cap on how much money/wealth they could own? Let's say the limit was $1 billion, to start with. The only counter-argument I can think of is that SpaceX might have run out of money if Elon "only" had $1 billion to pour into it, but I believe he started the company with just a $100 million investment of his own money. I'd also accept people being able to funnel billions into non-profit foundations which they control, as long as those foundations have goals which vaguely benefit society, such as "making humans a multi-planetary species".