The financial crisis didn't put a strain on everyone. The number of billionaires in the world has grown to more than 2,000 since 2009, and their aggregate net worth has more than doubled, reaching a record high.
The Wealth X and UBS Billionaire census report revealed a combined wealth of the world's billionaires to be $6.5 trillion, up from $3.1 trillion in 2009.
Eighty-eight percent of so-called "Ultra High Net Worth" individuals -- worth a minimum of $30 million each -- are men, and the average net worth is $139 million, up $1.8 million up from last year, according to the report.
The world's five richest men are Carlos Slim, Bill Gates, Amancio Ortega, Warren Buffett and Larry Ellison.
The five countries with the most billionaires are the U.S., China, Germany, the U.K. and Russia. The cities with the most billionaires are New York, Hong Kong, Moscow and London.
The Nobel Prize in economics was awarded to a trio of researchers Monday for their work...
