SHANGHAI/NEW YORK--Yahoo Inc will sell as much as half of its 40 percent stake in Chinese e-commerce powerhouse Alibaba Group for $7.1 billion, ending years of fractious talks over how to extract value from its most prized asset.Yahoo also increased its stock buyback authorization by $5 billion to $5.5 billion as a result of the deal but said it might instead opt to distribute some of the...
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