[Butso]

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If he was trying to answer the subject question as "yes", though, that is clearly an untenable position.

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as I said in my earlier post my position is that the economy is positive sum, not zero sum.

having thought about it some more, it is likely that billionaires invest in more risky propositions than the average investor because they are more probably more able to take advantage of high risk-high return opportunities such as startups, emerging economies, etc and these investments definitely contribute substantially to economic growth.