More and more enterprises are seeking to craft winning "base of the pyramid" (BoP) ventures, serving the worlds four billion poorest customers while alleviating poverty at the same time. Early first-generation ventures focused primarily on selling products to this massive and growing under-served market. Many of these initiatives did not scale, and some have failed. Crucial lessons have been learned along the way, and innovators are now succeeding with a more sophisticated and nuanced approach to "BoP." These second-generation business strategies have remained invisible to many leaders in the for-profit, non-profit, and development communities--until now. In this book, Ted London, Stuart L. Hart, and nine leading BoP thought and practice leaders show how to apply todays most significant BoP innovations, techniques, and business models. London, Hart, and their contributors go beyond providing low-cost products and extending distribution reach, demonstrating how to promote market development, innovation, and capability creation "with" BoP new customers, not "at" them. Readers will learn how to reconceptualize their opportunities, create sustainable business ecosystems, design new technologies with BoP in mind, and even transform entire sectors through collaborative entrepreneurship. From start to finish, this book shares proven, "on-the-ground" insights for building scalable, profitable businesses that are sustainable, and truly can help alleviate social ills.