This book investigates the hidden economic incentives that drive human behavior and social phenomena, often in counterintuitive ways. Steven D. Levitt, an economist at the University of Chicago, collaborates with journalist Stephen J. Dubner to apply rigorous economic analysis to unconventional topics. By examining data sets ranging from sumo wrestling to real estate, the authors argue that the modern world is governed by incentives that are frequently misunderstood or ignored by traditional social observation.

The work is widely regarded as a popularization of behavioral economics that successfully bridges the gap between academic research and general interest reading. Its methodology is frequently cited for its ability to reveal the underlying logic of complex social systems through accessible, data-driven inquiry.