Interestingly, the old adage that says 'the rich keep getting richer' isn't all that far off. There were reportedly 470 billionaires in 2000, which exploded to a surprising 1,426 by 2013! Not only that, but the combined wealth of all the billionaires in the world has increased as well: from a paltry $898 billion in 2000 (if that can be considered paltry, even under the best of conditions), to an astounding $5.4 TRILLION in 2013. In my opinion, $5.4 trillion sounds like a LOT of money, but who possesses the most of it, and how did they get it?

Enjoyed this list? Check out our latest list of the 10 richest musicians in the world, where we go into detail of each musician's net worth and how they made their fortune.