The Undercover Economist : Exposing Why the Rich Are Rich, the Poor Are Poor and Why You Can Never Buy a Decent Used Car! by Tim Harford

I listened to this on our trip. The first part was a little dull (but would be a good primer for someone who didn't know anything about markets) but the rest was very interesting and I recommend it for anyone interested in an economic (as opposed to ideological) approach to health care, globalization, poverty, etc. Recommended.