Given the necessary investment in technology coupled with the infancy of the market, large well-capitalized retailers have been most active in the space to date, according to Todd Ablowitz, president of consulting firm Double Diamond Group. For example, last year Amazon and eBay accounted for about 70% of all physical goods sold on mobile phones. However, private third-party service companies are enabling smaller retailers to launch mobile e-commerce sites and accept mobile payments for goods and services.

Business Insider, March 11, 2010
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