In his 2012 book Stealth of Nations, Robert Neuwirth challenges conventional thinking by examining the world's informal economy close up. To do so, he spent four years living and working with street vendors and gray marketers, to capture its scope, its vigor--and its lessons. He calls it “System D” and argues that it is not a hidden economy, but a very visible, growing, effective one, fostering entrepreneurship and representing 1.8 billion jobs worldwide.
Before this, for his previous book Shadow Cities (also a TEDTalk), he spent two years exploring one of the most profound trends of our time: the mass migration of the world's population into urban shantytowns. A billion people live as squatters. Life in a favela, slum, shantytown is hard: no water, no transport, no sewage. But in the squatter cities of Rio, Nairobi, Istanbul and Mumbai, Neuwirth discovered restaurants, markets, clinics and effective forms of self-organization.
Our challenge, Neuwirth says, isn't to end squatter cities or shut down gray markets--but to engage and empower those who live and work in them.