I skimmed a lot of this book. Unfortunately it wasn't quite as interesting or easy-to-read as Freakonomics, which I thoroughly enjoyed. It was due back to the library in 2 days, with reserves on the title, so I didn't actually finish it. Some of the theories were interesting (law of unintended consequences, etc.), but I think this book was written more for those who really study economics, not those (like me) who like to read about it as a general interest.