http://news.bbc.co.uk/1/hi/business/5369460.stm
For the first time, the richest 400 tycoons in the US all have a personal wealth of at least $1bn (£526m), Forbes magazine has reported.
Microsoft boss Bill Gates kept top spot for a 13th consecutive year with investment guru-turned-philanthropist Warren Buffett in second place.
Casino and hotel owner Sheldon Adelson has leapt from 15th to third ranking.
The rich list as a whole is worth $1.25 trillion, compared with $1.13 trillion a year ago, Forbes said.
Four of the top ten came from the Wal-Mart owning Walton family.
Mr Adelson's surge in fortune comes largely from a decision to open a casino in Macau, an island off south-eastern China renowned for its gambling.
Forbes estimates that Mr Adelson has been earning about $1m an hour for the past two years.
For the first time, the richest 400 tycoons in the US all have a personal wealth of at least $1bn (£526m), Forbes magazine has reported.
Microsoft boss Bill Gates kept top spot for a 13th consecutive year with investment guru-turned-philanthropist Warren Buffett in second place.
Casino and hotel owner Sheldon Adelson has leapt from 15th to third ranking.
The rich list as a whole is worth $1.25 trillion, compared with $1.13 trillion a year ago, Forbes said.
Four of the top ten came from the Wal-Mart owning Walton family.
Mr Adelson's surge in fortune comes largely from a decision to open a casino in Macau, an island off south-eastern China renowned for its gambling.
Forbes estimates that Mr Adelson has been earning about $1m an hour for the past two years.
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