Which is more dangerous, a gun or a swimming pool? What do schoolteachers and sumo wrestlers have in common? Why do drug dealers still live with their moms? How much do parents really matter? How did the legalization of abortion affect the rate of violent crime?

These may not sound like typical questions for an econo-mist to ask. But Steven D. Levitt is not a typical economist. He is a much-heralded scholar who studies the riddles of everyday life—from cheating and crime to sports and child-rearing—and whose conclusions turn conventional wisdom on its head.

Freakonomics is a groundbreaking collaboration between Levitt and Stephen J. Dubner, an award-winning author and journalist. They usually begin with a mountain of data and a simple question. Some of these questions concern life-and-death issues; others have an admittedly freakish quality. Thus the new field of study contained in this book: freakonomics.

Through forceful storytelling and wry insight, Levitt and Dubner show that economics is, at root, the study of incentives—how people get what they want, or need, especially when other people want or need the same thing. In Freakonomics, they explore the hidden side of . . . well, everything. The inner workings of a crack gang. The truth about real-estate agents. The myths of campaign finance. The telltale marks of a cheating schoolteacher. The secrets of the Klu Klux Klan.

What unites all these stories is a belief that the modern world, despite a great deal of complexity and downright deceit, is not impenetrable, is not unknowable, and—if the right questions are asked—is even more intriguing than we think. All it takes is a new way of looking.

Freakonomics establishes this unconventional premise: If morality represents how we would like the world to work, then economics represents how it actually does work. It is true that readers of this book will be armed with enough riddles and stories to last a thousand cocktail parties. But Freakonomics can provide more than that. It will literally redefine the way we view the modern world.

"Forget your image of an economist as a crusty professor worried about fluctuating interest rates: Levitt focuses his attention on more intimate real-world issues, like whether reading to your baby will make her a better student. Recognition by fellow economists as one of the best young minds in his field led to a profile in the New York Times, written by Dubner, and that original article serves as a broad outline for an expanded look at Levitt's search for the hidden incentives behind all sorts of behavior. There isn't really a grand theory of everything here, except perhaps the suggestion that self-styled experts have a vested interest in promoting conventional wisdom even when it's wrong. Instead, Dubner and Levitt deconstruct everything from the organizational structure of drug-dealing gangs to baby-naming patterns. While some chapters might seem frivolous, others touch on more serious issues, including a detailed look at Levitt's controversial linkage between the legalization of abortion and a reduced crime rate two decades later. Underlying all these research subjects is a belief that complex phenomena can be understood if we find the right perspective. Levitt has a knack for making that principle relevant to our daily lives, which could make this book a hit. Malcolm Gladwell blurbs that Levitt 'has the most interesting mind in America,' an invitation Gladwell's own substantial fan base will find hard to resist. 50-city radio campaign." Publishers Weekly (Starred Review) (Copyright Reed Business Information, Inc.)

"An eye-opening, and most interesting, approach to the world." Kirkus Reviews

"The familiar Gladwell manner — a kind of breezy drifting from one entertaining anecdote to the next, floating effortlessly past references to contemporary social-science research — gets recycled here into what can only be called a style of evasive lucidity." Newsday

"If Indiana Jones were an economist, he'd be Steven Levitt....Criticizing Freakonomics would be like criticizing a hot fudge sundae." Wall Street Journal

"Steven Levitt has the most interesting mind in America....Prepare to be dazzled." Malcolm Gladwell, author of Blink and The Tipping Point

"[An] excellent, readable book..." Booklist

"It might appear presumptuous of Steven Levitt to see himself as an all-purpose intellectual detective, fit to take on whatever puzzle of human behavior grabs his fancy. But on the evidence of Freakonomics, the presumption is earned." Jim Holt, The New York York Times

This newly revised edition of the "New York Times" bestseller offers a view of how the world really works, from two of today's most original thinkers.

Steven D. Levitt teaches economics at the University of Chicago; he recently received the John Bates Clark Medal, awarded every two years to the best American economist under forty.