After watching Groupon's ascent, Harvard-trained entrepreneur Bom Kim created the discount site's South Korean equivalent -- Coupang. As the e-discounts model flopped, Kim branched out into online retail, leveraging South Korea's densely packed and Web-savvy population to build a $650 million e-commerce business. "Our model isn't even close to Groupon. If anything, we're closer to Amazon," Bom says.

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