Business Insider reports that Elon Musk is $8 billion away from surpassing Bill Gates as the world's second-richest person.br This week Musk's wealth has continued to climb.br Musks networth hit $114 billion after Tesla was added to the S&P 500 index, edging out Facebook CEO Mark Zuckerberg.br It's gained another $10.2 billion after Tesla shares spiked 10 on Wednesday, according to Bloomberg.