I'm very glad I did! Ariely's a very engaging writer and a smart social scientist with a knack for illustrating his hypotheses about human behavior through elegant and simple experiments. There's no better time than now to read Predictably Irrational, as Ariely's theories about cheating, incentives, self-fulfilling prophecy, self control, and how we value the things we own versus the things we desire go a long way to explaining the econopocalypse, and also provide an excellent framework for analyzing proposals to get the economy moving again.
For example, Ariely describes a series of experiments that measure work performance among randomly selected groups of people where one group is paid nothing, one group is paid a little, and a third is paid a lot. The group that was paid a little did a little. The group that was paid a lot did a lot. The group that was paid nothing did even more. Ariely and colleagues go on to refine this experiment by changing the reward to gifts (chocolates) instead of money, then to gifts whose value is enumerated ("you will receive a $5 box of Godiva chocolates") and examines how this effects performance. He also examines what happens to performance in situations in which one is at first paid to work, then asked to do the same work again for free.
The results are fascinating, and point to the idea that we work hard for money, and we work hard for social reasons, but that one can short-circuit the other, and lastingly so. He then goes on to explain how companies that ask their employees to work harder for social reasons ("you're part of the team") but dismiss the employees for economic reasons ("we need to cut costs") end up in an impossible place. So do companies that ask customers to come make a purchase as a social transaction ("join the family!") but then treat the transaction after the fact as a purely economic matter ("you should have read the fine-print").
Every chapter works in this vein, and taken as a whole, Predictably Irrational presents a fatal blow to the idea that we can run a system on the assumption that people will take courses of action based on rational calculus, unclouded by cognitive blind-spots that make it practically impossible to find the best course of action.
Of course, this is already an accepted reality of the business-world -- it's why, for example, companies worry that an overly discounted price will reset consumer sentiment about the value of their product. It's why advertisers run "lifestyle" ads that don't feature the product or enumerate its benefits. It's why there are introductory offers that increase in price thereafter. All of these are designed to appeal to emotion, not rational calculus.
But in economics, this irrationality is treated like quantum physics: sure, it's true that this happens on the subatomic scale, but the whole system behaves in a rational, Newtonian fashion and can be treated as such. As Ariely persuasively argues, the economic world is full of a lot more weird, irrational quantum effects than we assume.
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I write books. My latest is a YA science fiction novel called Homeland (it's the sequel to Little Brother). More books: Rapture of the Nerds (a novel, with Charlie Stross); With a Little Help (short stories); and The Great Big Beautiful Tomorrow (novella and nonfic). I speak all over the place and I tweet and tumble, too.