As economic growth slows in the developed world, the base of the pyramid (BoP) represents perhaps the last great, untapped market. Of the world's 7 billion inhabitants, around 4 billion live in low-income markets in the developing world. These 4 billion people deserve-and, increasingly, are demanding-better lives. At the same time, the business community seeks new opportunities for growth, and the development community is striving to increase its...