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Passion for Causes and a Sense of Duty Prompt Donors to Give Big Sums
The billionaire investor and philanthropist Warren E. Buffett is not the only American to have pledged most of his wealth to charity. While none of the 80 or so members of the 50% League are billionaires, they have all donated at least half of their income over the past three years, or half of their net worth at some point in...