Reply #5: Are you sure about that #? There are more than 400 billionaires in the U.S.

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Their average net worth is $3.5 billion. I think virtually all these people realize a return far in excess of only .5%/year on their capital. http://finance.yahoo.com/career-work/article/109029/worlds-billionaires-2010

This year the World's Billionaires have an average net worth of $3.5 billion, up $500 million in 12 months. The world has 1,011 10-figure titans, up from 793 a year ago but still shy of the record 1,125 in 2008. Of those billionaires on last year's list, only 12% saw their fortunes decline.

U.S. billionaires still dominate the ranks — but their grip is slipping. Americans account for 40% of the world's billionaires, down from 45% a year ago.

The U.S. commands 38% of the collective $3.6 trillion net worth of the world's richest, down from 44% a year ago.

Of the 97 new members of the list, only 16% are from the U.S. By contrast, Asia made big gains. The region added 104 moguls and now has just 14 fewer than Europe, thanks to several large public offerings and swelling stock markets.