Carlos Slim
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Carlos Slim tops Forbes rich list for fourth year

4 March 2013 Last updated at 16:21 GMT

Mexican tycoon Carlos Slim has topped Forbes magazine's list of the world's richest billionaires for a fourth year.

The magazine estimates that Mr Slim, whose business interests range from telecommunications to construction, is worth $73bn (£49bn).

He is followed by Microsoft founder Bill Gates on $67bn.

Clare O'Connor is Forbes' wealth writer.