who is the richest man in america in 2019?
['Jeff Bezos, Amazon – $114 billion.', 'Bill Gates, Microsoft – $106 billion.', 'Warren Buffett, Berkshire Hathaway – $80.8 billion.', 'Mark Zuckerberg, Facebook – $69.6 billion.', 'Larry Ellison, software – $65 billion.', 'Larry Page, Google – $55.5 billion.', 'Sergey Brin, Google – $53.5 billion.']