Masayoshi Son, the maverick head of Japanese mobile giant SoftBank, has sunk millions into a taxi app and floating wind turbines, all in one week. It was nothing unusual, though.

Indeed, over the past six weeks, the parent company of U.S. carrier Sprint has invested nearly US$1 billion in companies outside Japan. The bulk of the cash went to Snapdeal, India’s largest online marketplace, part of Son’s goal of plowing $10 billion into the subcontinent over the next 10 years.

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