Which means, I guess, these poor 40 million wealthiest Americans wind up with only a meager $600 billion left

‘Giving Pledge,’ Promoted by Buffett and Gates, Stirs a Vigorous Debate - NYTimes.com

WITHOUT a doubt, the biggest event in philanthropy this year was the Giving Pledge, a commitment by 40 of the wealthiest Americans to give away at least half of their fortunes, about $600 billion.