Freakonomics Rev Ed

Interesting enough to hold my interest on the commute. Which is always the primary criterion. But it could be a third as long as it is. Preface is a summary of the book. Including information presented as surprising in the body of the book. Expanded portion of this edition is the original essays that began the authors' collaboration. Essentially, covering the same material again. Conclusions are interesting, but would have preferred more of the reasoning not to mention research citations. For example, conclusions regarding the economics of gun regulation are presented largely without evidence.