Just for comparison...
I think it was recently stated that Exxon Mobil is the most profitable company in the world making $40 Billion a year. And this COMPANY is a world wide oil giant.
No one person generates $10 Billion/year.
If a person worth $10 Billion had investments in certain stocks then they could double in one year to make the value $20 Billion. But I don't consider this EARNING $10 Billion per year because stocks can double and then fall very fast. That is just all based on market value which is fickle.
I think the google guys each lost about $8 Billion in value in the last 6 months.
So earning that kind of money and having your net value increase by that amount because of stock market valuations is 2 different things.
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