Book excerpt: Enter the world of the social entrepreneur. A global community of doers, thinkers and leaders who mix business with grass-roots activism to make social change possible. Vinod Kapur created a new breed of chicken that feeds some of the world’s poorest villagers. Betty Makoni empowers young women across Africa through her Girl Child Network. Stephen Burks connects developing world artisans with high fashion brands. They are but three. In this book, author and activist Asheem Singh explores how a movement of tiny ventures evolved into a global humanitarian and financial juggernaut, revealing new ways to fight privilege and inequality, rewire philanthropy, government and even capitalism itself. This is a guide to an exhilarating and inspiring world where, through our giving, campaigning and even through our choices as consumers, we can all play a crucial role in taking on the biggest social challenges of our time.