The world's 500 richest people added $336 billion to their wealth in a day, according to Bloomberg Billionaires Index, bringing their collective net worth to $13.3 trillion. Musk's fortune jumped $164 billion on Monday, as it hit $1.27 trillion after SpaceX's IPO. Currently, top 50 richest people hold $6.5 trillion, nearly equal to $6.8 trillion held by the bottom 450.