Look around: the largest migration in human history is under way. For the first time ever, more people are living in cities than in rural areas. Many of these migrants first live in slums at the outskirts of cities. But these "arrival cities" are not just places of misery. They are also the location of amazing innovation, successful community-owned businesses, and upward mobility.
Doug Saunders, journalist, European bureau chief of The Globe and Mail, and author of Arrival City: How The Largest Migration in History is Reshaping Our World