Slums in the mega-cities in the developing world are creative hotbeds where many solutions to problems are found. But there’s one challenge: The slums are poorly connected to the world economy. Now Dharavi, a slum in the heart of Mumbai—famously portrayed in Slumdog Millionaire—has launched an online marketplace, dharavimarket.com, to sell the crafts of thousands of cottage industries including pottery, leatherwork and zari embroidery. It is estimated that the enterprises of Dharavi’s one million inhabitants generate revenue of over $650 million a year.