The richest people

"The world's 300 richest people added more than half a trillion dollars to their collective net worth in 2013, according to an index compiled by Bloomberg. The billionaires had a collective net worth of $3.7tn (£2.2tn, €2.7tn) at the market close on 31 December, up $524bn from the previous year, according to the Bloomberg Billionaires Index." (thanks Amir)