Freakonomics: A Rogue Economist Explores the Hidden Side of Everything is the debut non-fiction book by University of Chicago economist Steven Levitt and New York Times journalist Stephen J. Dubner. Published on April 12, 2005, by William Morrow, the book has been described as melding pop culture with economics. By late 2009, the book had sold over 4 million copies worldwide. Based on the success of the original book, Levitt and Dubner have grown the Freakonomics brand into a multi-media franchise, with a sequel book, a feature film, a regular radio segment on National Public Radio, and a weekly blog. Overview The book is a collection of articles written by Levitt, an expert who had gained a reputation for applying economic theory to diverse subjects not usually covered by "traditional" economists. In Freakonomics, Levitt and Dubner argue that economics is, at root, the study of incentives. The book's chapters cover: Chapter 1: Discovering cheating as applied to teachers and sumo wrestlers, as well as a typical Washington, D.C.–area bagel business and its customers Chapter 2: Information control as applied to the Ku Klux Klan and real-estate agents Chapter 3: The economics of drug dealing, including the surprisingly low earnings and abject working conditions of crack cocaine dealers Chapter 4: The role legalized abortion has played in reducing crime, contrasted with the policies and downfall of Romanian dictator Nicolae Ceauşescu (Levitt explored this topic in an earlier paper entitled "The Impact of Legalized Abortion on Crime", written with John Donohue) Chapter 5: The negligible effects of good parenting on education Chapter 6: The socioeconomic patterns of naming children (nominative determinism) One example of the authors' use of economic theory involves demonstrating the existence of cheating among sumo wrestlers. In a sumo tournament, all wrestlers in the top division compete in 15 matches and face demotion if they do not win at least eight of them. The sumo community is very close-knit, and the wrestlers at the top levels tend to know each other well. The authors looked at the final match, and considered the case of a wrestler with seven wins, seven losses, and one fight to go, fighting against an 8–6 wrestler. Statistically, the 7–7 wrestler should have a slightly below even chance, since the 8–6 wrestler is slightly better. However, the 7–7 wrestler actually wins around 80% of the time. Levitt uses this statistic and other data gleaned from