well....i guess my facts are a bit outdated. but how come Ingvar Kamprad isn't even on that list ? the no.10 guy is worth 23 billion, which is much less than 53 billion (obviously)
Astec: read
this bit about a billion, although idk how true it is
EDIT: i've figured it out (as i'm rather interested, because this stuff is pretty fascinating)
when Kamprad owned IKEA, it was considered part of his wealth, so owning IKEA, he was worth $53 billion.but he was forced to sell it, so now he's only worth $18.5 billion, leaving him 13th on the list of world's richest men.
although Forbes still has Gates at $46.6 billion...