According to Boo, this is a key problem for people in the developing world: making sense of what she calls "the infrastructure of opportunity," an infrastructure that can seem designed to keep them down.

"We talk a lot about infrastructure in cities, and it's talking about highways and it's talking about trains, but I think more important to people who are low income is, how do I get from here to there? How do I become part of the affluence that's surrounding me?" Boo says.