Bill Gates has emerged as a key leader in the coronavirus era, building factories for vaccine development and pushing to expand worldwide testing. He and Warren Buffet crafted "The Giving Pledge" a little over a decade ago. The document is a public declaration signed by some of the world's wealthiest people. One idea Gates and his aides are considering is to create a "marketplace" for Giving Pledge signers and others in order to pool donations from more than 200 billionaires.

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