when we see these reports/analysis it seems the answer is always the same: Capital Gain.
However, I think this whole line of inquiry is mis-titled: these reports always tell us how the rich people are making now their income. Which, I feel, is not a good hint as to how you can become rich.
For the greater public, the question of "how the rich people went from 0 to $1B" might more interesting than "how the rich people maintain their $1B+". Definitely I find the latter more interesting than the former (probably because I don't have $1B+)
For the greater public, the question of "how the rich people went from 0 to $1B" might more interesting than "how the rich people maintain their $1B+". Definitely I find the latter more interesting than the former (probably because I don't have $1B+)