The billionaires listed in the Forbes 400 are perceived to have pledged to donate to charity than the U.S. as a whole gives in a year.
According to Forbes, the philanthropic pledges of just 400 people parallel the annual philanthropic GDP of the whole nation. The Forbes 400 "self-made" billionaires are identified as the most generous of the lot. The group includes business founders, co-founders, and CEOs of companies tend to help others "climb as they have".
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