Our research has pointed to the importance of trading platforms: The study of Cellbazaar in Bangladesh as well as the work on agriculture in the last research cycle. It appears from this NYT report that the demand for trading (and payment) platforms is most vibrant in the mobile space. John J. Donahoe, eBay’s chief executive, attributed the company’s performance in part to an early bet that mobile phones would become a platform for commerce, with PayPal providing a lead in mobile payments. “We’re the largest mobile commerce and payments provider in the world,” Mr.