Predictably Irrational Decision-Making

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Humans often act in irrational ways...for example, making poor decisions about dating, and spending money unwisely. Recent experiments reveal our irrational behavior can be quite predictable! MIT professor Dan Ariely explains the forces that lead to irrational behavior in his new book Predictably Irrational.

Weigh in: What's the most irrational decision you've ever made? And do you know why you made it?