In the 25th year of Forbes magazine's rankings of the 400 riches Americans, the net worth at the poor end of the list is $1.3 billion, up from a flat $1 billion a year ago. Microsoft founder Bill Gates still tops the list with $59 billion, closely followed by Warren Buffett ($52 million). Forty-five of the members appear on the list for the first time.
Kirk Kerkorian posted the biggest gain from last year by doubling his worth to $18 billion. Former Enron trader John Arnold is the youngest person on the list, at 33. Several notables dropped off, including Starbucks founder Howard Schultz and Campbell's Soup's Dorrance Hill Hamilton, who has been a feature on the list since it began.