Gates-Buffett Example Worth Its Weight in Gold

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The collaboration of Warren Buffett and Bill and Melinda Gates transfixed the nonprofit world four years ago when they announced the biggest philanthropic merger in history, producing a foundation that will probably be worth at least $60-billion one day. But last month’s announcement that the Gateses have joined forces with Mr. Buffett on a campaign to persuade the nation’s billionaires to give 50 percent of their wealth could be an even more important milestone—especially