Dan Ariely (@danariely) is a behavioral economist and bestselling author of Predictably Irrational: The Hidden Forces That Shape Our Decisions and the upcoming Payoff: The Hidden Logic That Shapes Our Motivations. The Cheat Sheet: How does the What the Hell effect keep us making bad decisions even when we know they're bad? Are we ever truly rational, unbiased, or impartial? What's the best time to appear before a judge? Transparency in our lives can often backfire. How motivation works (and doesn't work) and how we can use our own psychology against ourselves.

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