Predictably Irrational: The Hidden Forces That Shape Our Decisions by Dan Ariely, HarperCollins Books, 2008
Basic Premise:
“Standard economics assumes that people are rational — that they have all the pertinent information about their decisions, that they can calculate the value of the different options they face, and that they are cognitively unhindered in weighing the ramifications of each potential choice”. That is, that people are capable of making the right decisions for themselves. But, Ariey — and other behavioral economists — observe that “people are really far less rational than standard economic theory assumes. Moreover, their irrational behaviors are neither random nor senseless. They are systematic, and often repeated, so they are predictable”. For example:
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People tend to overvalue stuff that they own … it’s called the “endowment effect”.
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Ownership can be real & full, or virtual & partial (e.g. bidding for items on eBay)
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The sense of ownership is enhaced by “sweat equity” … the IKEA effect.
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Most people will opt for a mid-priced version of a product (over the high or low priced version) … it’s called “aversion to extremes”.
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A higher priced pill is perceived to relieve pain more than a lower priced pill … even when they’re the same pills — real or placebos.
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People can’t resist the power of free offers … even when they’re not really free.
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Many people will travel 15 minutes to save $10 on a $25 item (say, a DVD), but won’t travel 15 minutes to save the same $10 on a higher priced item (say, a car) … even though the time and savings are the same … it’s called the “relativity effect”.
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Many people will do jobs (“favors”) for their friends for free — as long as the task is unrelated to their “day job”.
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Many people who do favors for others are insulted if they are offered monetarycompensation, but willingly take small gifts for their efforts.
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Most people wouldn’t consider taking a few bucks from the petty cash drawer, but many people think it’s ok to jack a pen from their office.
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In experiments, most “tempted students cheated on tests … but there was an upper limit — they only cheated “a little bit”.
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Students who sign honor pledges on exams are far less likely to cheat … even if their school doesn’t have an honor code
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The book is a quick, easy read, and the author has a cool web site:
www.predictablyirrational.com
I’ll cite a few of the book’s more interesting examples in subsequent posts.
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