In development circles, there is now widespread consensus that social entrepreneurs represent a far better mechanism to respond to needs than we have ever had before--a decentralized and emergent force that remains our best hope for solutions that can keep pace with our problems and create a more peaceful world. David Bornstein's previous book on social entrepreneurship, How to Change the World, was hailed by Nicholas Kristof in The New York Times as "a bible in the field" and published in more than twenty countries.