The dismal science of economics is not as firmly grounded in actual behavior as was once supposed. In "Predictably Irrational," Dan Ariely told us why.

Why you should listen

Dan Ariely is a professor of psychology and behavioral economics at Duke University and a founding member of the Center for Advanced Hindsight. He is the author of the bestsellers Predictably Irrational, The Upside of Irrationality, The Honest Truth About Dishonesty, Dollars and Sense and Amazing Decisions -- as well as the TED Book Payoff: The Hidden Logic that Shapes Our Motivations. He is also co-creator of the film documentary (Dis)Honesty: The Truth About Lies.

Through his research and his (often amusing and unorthodox) experiments, he questions the forces that influence human behavior and the irrational ways in which we often all behave.

What others say

“If you want to know why you always buy a bigger television than you intended, or why you think it's perfectly fine to spend a few dollars on a cup of coffee at Starbucks, or why people feel better after taking a 50-cent aspirin but continue to complain of a throbbing skull when they're told the pill they took just cost one penny, Ariely has the answer.” — Daniel Gross, Newsweek