> where is that money coming from?

They're creating it. Wealth is not a zero-sum game.

If what you're saying is true we'd see the number of rich decrease exponentially. That is objectively not the case.

> Where is that money coming from?

Not sure what you mean by this?

If you own several similar assets, and sell one for a large profit, it brings up the value of the others on paper. Stock shares for example.