Mobile eBay purchases are expected to increase 80% this year, leading eBay to project $20 billion in worldwide sales in 2013, compared with $13 billion last year. Such rapid growth may be affecting traditional retailers, but eBay European chief Clare Gilmartin says it's the company's "disruptive nature I found the most compelling when I joined. The massive growth opportunity for retailing businesses was disruptive. And there was also the chance to utterly transform the way people shopped through technology."

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