Frogtek is a social enterprise that helps small shopkeepers in Mexico and Colombia increase sales with the use of mobile apps. Its products offer significant potential to boost income at the bottom of the pyramid, but there’s a catch. Few micro-sized customers can afford to buy the hardware—in this case, tablet computers and barcode scanners—needed to run the apps that will help their businesses grow. Similar cash flow problems frustrate entrepreneurs throughout the developing world. A solution …

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