Forbes reports billionaire boom

A worldwide economic boom has yielded a record number of dollar billionaires in the past year, according to Forbes.

Their number rose by 15% to 793 with India taking the lead in Asia and new Russians lining up to fill the gap left by jailed Mikhail Khodorkovsky.

Microsoft's Bill Gates tops the list for the 12th year running, with a net worth of $50bn (£29bn).