Dan Ariely

Dan Ariely is an Israeli-American behavioral economist whose Predictably Irrational explores the hidden forces that cause people to make consistently irrational decisions.

Dan Ariely is a professor of psychology and behavioral economics who built an academic career studying why people make the decisions they do — and specifically why those decisions so consistently deviate from what classical economic theory predicts. Predictably Irrational, published in 2008, brought his research to a popular audience through accessible writing and a series of clever experiments that illuminate the invisible forces shaping human choice: the power of “free,” the distorting effect of anchoring, the gap between our expected and actual behavior around cheating and self-control.

The book is engaging and often genuinely surprising. Ariely is a good storyteller, and his willingness to use himself as a subject — he was badly burned as a teenager, an experience that shaped his interest in how people process pain and expectations — gives the work a personal dimension unusual in pop economics. The experiments he describes are memorable, and the conclusions are presented with appropriate nuance.

However, Ariely’s career has been significantly clouded by a data fabrication scandal: a 2021 investigation found strong statistical evidence of fraud in a study he co-authored on honesty — a painful irony. His defenders argue that Predictably Irrational itself is not implicated, and the book’s broad findings are consistent with the wider behavioral economics literature. But readers should be aware of the context. The ideas in the book remain interesting and worth engaging with; the trust placed in Ariely personally as a researcher requires more caution than it did before the scandal.