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Predictably Irrational, Revised and Expanded Edition: The Hidden Forces That Shape Our Decisions Hardcover – Illustrated, May 19, 2009

4.5 4.5 out of 5 stars 10,975 ratings

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The groundbreaking bestseller from iconic behavioral psychologist Dan Ariely, now the inspiration for the Fall 2023 NBC show The Irrational

"A marvelous book… thought provoking and highly entertaining."

—Jerome Groopman, New York Times bestselling author of How Doctors Think

"Ariely not only gives us a great read; he also makes us much wiser."

—George Akerlof, 2001 Nobel Laureate in Economics

"Revolutionary."

New York Times Book Review

Why do our headaches persist after we take a one-cent aspirin but disappear when we take a fifty-cent aspirin? Why do we splurge on a lavish meal but cut coupons to save twenty-five cents on a can of soup?

When it comes to making decisions in our lives, we think we're making smart, rational choices. But are we?

In this newly revised and expanded edition of the groundbreaking New York Times bestseller, Dan Ariely refutes the common assumption that we behave in fundamentally rational ways. From drinking coffee to losing weight, from buying a car to choosing a romantic partner, we consistently overpay, underestimate, and procrastinate. Yet these misguided behaviors are neither random nor senseless. They're systematic and predictable—making us predictably irrational.

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4.5 out of 5 stars
10,975 global ratings

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Customers say

Customers find the book an enjoyable and insightful read with relevant examples that make the teachings understandable. They appreciate the author's humor, playful presentation, and engaging tone. Many consider it a worthwhile purchase and a modern guide to pricing and merchandising. The ethics and human behavior topics are interesting and relatable, shedding light on the plight of being human. However, opinions differ on the irrationality aspect, with some finding the stories interesting in their own right, while others mention it's predictable and subjective.

AI-generated from the text of customer reviews

640 customers mention "Readability"575 positive65 negative

Customers find the book easy to read and engaging. They find it eye-opening and fun. The writing quality is high, though some readers feel the book could be shorter.

"...BOTTOM LINE - Predictably Irrational is a wonderful book with new insights into irrational behavior in people...." Read more

"...Still, they were fun to read, and I will probably try some of them on my friends. === The Not So Good Stuff === *..." Read more

"...Forces That Shape Our Decisions" by Ariely Ariely (PI), was an interesting read, and deserves to be looked at by economist, psychologist, marketer,..." Read more

"This is a great book and wonderful addition to our library." Read more

577 customers mention "Insight"550 positive27 negative

Customers find the book insightful and educational. It sheds light on irrational decisions, providing relevant examples and intriguing ideas. The book helps readers understand how we make decisions and become more aware of their own thinking patterns. Readers appreciate the clever experiments conducted by the author.

"...principles explained in the book through experiments and startling revelations. It is easy to read and highly entertaining...." Read more

"...Some of the experiments product results that were quite unexpected, and with a little thinking you can use some of this information into whatever..." Read more

"...personally engrossed while reading this novel due to the parallels of irrational behavior I discovered I also exhibited and will be actively..." Read more

"This is a great book and wonderful addition to our library." Read more

126 customers mention "Humor"111 positive15 negative

Customers find the book engaging and entertaining. They appreciate the author's witty and charming writing style that keeps readers interested. The presentation of concepts is simple and fun, making it easy for readers to understand.

"...knack of explaining all the profound concepts in a simple and entertaining manner...." Read more

"...The writing is fun, clear, and fit for a mass audience. It is an easy read and not too mentally taxing...." Read more

"...It's not dry and analytic but in a very easy to read and fun manner. One of the books I think I could recommend to just about anyone!" Read more

"...book I read by Ariely, "Predictably Irrational" has a lot of humorous anecdotes and plenty of insightful wisdom...." Read more

32 customers mention "Value for money"28 positive4 negative

Customers find the book provides good value for money. They appreciate its useful insights on pricing and merchandising, especially the anchor price explanation. The book is described as an easy read with a clear style.

"...Price is so powerful that it can drive the Placebo Effect - the more the price, the more the utility you derive from the product...." Read more

"...the interesting concepts in this book, which can of good use in product and pricing decisions are:..." Read more

"I needed this book for school, good price and came in great condition! The book is pretty interesting as well." Read more

"...is it nonfiction, a genre which I seldom read, but it is also about Economics, Sociology, and Business, topics I have very little knowledge about...." Read more

14 customers mention "Ethics"14 positive0 negative

Customers find the book insightful and engaging. They appreciate its exploration of human behavior, marketing, and honesty. The author is unafraid to express himself and reveal his vulnerabilities. Overall, readers feel the book offers a fascinating look at human nature and the plight of being human.

"...Trust is an important public resource and a necessary lubricant of the economy. A few bad players in the market can completely erode it. -..." Read more

"...I have never seen anything like it in a book. It reveals his humility, for it shows his generous acknowledgement that great work cannot be..." Read more

"...The last few chapters on cheating and trust were very insightful...." Read more

"...the opportunity to see our vulnerabilities and put defenses in place to protect our decision making." Read more

82 customers mention "Irrationality"45 positive37 negative

Customers have mixed opinions about the book. Some find the stories interesting and memorable, with examples, anecdotes, and experiments. They say each chapter breaks down an everyday behavior and investigates our reasoning behind various decisions. However, others feel the book is not a rigorous behavioral study and the thought process is sloppy.

"...The author offers examples, anecdotes, and experiments to illustrate how humans behave in seemingly irrational ways; ways that are not captured by..." Read more

"...and it's not quite a behavioral psychology book (read Sway) so it falls somewhere in the middle - and..." Read more

"...One last comment...the chapters on dishonesty are fascinating!" Read more

"...: all of the authors studies are artificial creations and not based on real life. That’s true...." Read more

20 customers mention "Economics"13 positive7 negative

Customers have different views on the economics. Some find it interesting to look at the social side of microeconomics and how people act and react to various real-life situations. They appreciate the chapters about social vs. economic customs and how we respond to the word. Others feel the author is not an economist, not quite a behavioral psychologist, and that the book lacks statistical analysis. There are also complaints that the studies are artificial and not based on real life.

"...Rational decision-making is an important axiom of basic economic theory...." Read more

"...I found particularly interesting the chapters about social vs economic customs and about how we respond to the word 'free'...." Read more

"...It's not quite an economics book (for a much better analysis of the many failings of neoclassical economics, read Debunking Economics by Keen) and it..." Read more

"...he tests such topics as the power of "free!", money's effect on social relationships, feelings of ownership over material and nonmaterial..." Read more

Great book, bad purchase experience
4 out of 5 stars
Great book, bad purchase experience
It's a great book, recommended by my professor of a class called Decision Making Under Uncertainty. Very inspirational!The reason I can't give it a five-star is because of Amazon. The upper right corner of the front cover is completely folded when it's in the box. I believe it's brand new, but that fold makes the purchasing experience not so pleasant. Of course I won't waste time to exchange it. Hope it will not happen in the future.
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Top reviews from the United States

  • Reviewed in the United States on March 3, 2013
    I have not written any product reviews on Amazon, but I was forced into writing one because of my sincere admiration and new-found respect for Prof. Dan Ariely. I was introduced to the science of Behavioral Economics and the irrational decisions people make in their lives. The author, through his experiments, has an uncanny knack of explaining all the profound concepts in a simple and entertaining manner. The contents in this book will quite literally open your eyes and make you wonder how people are living in this so-called idealistic world of rational decision making. Some of the key ideas presented in this book are:

    -> How humans perceive value - "not in absolute terms, but one with respect to another," and this is how companies and marketers deceive people with "seemingly attractive" offers that you cannot resist.
    -> Market forces of supply and demand only apply to rational people - in the real world, companies exploit people's irrationality and influence prices and demand.
    -> The power of FREE - People are, in essence, losing some other resource in trying to procure FREE items.
    -> The wonderful distinction of market and social norms, and why and how they cannot coexist. He also explains how companies can motivate their employees using social benefits, which are cheaper and stronger than financial incentives.
    -> As long as money is not involved, we are caring social animals.
    -> Why people exhibit different behaviors when they are "normal" (cold state) and when they are "aroused" (hot state). Learning to bridge the gap between the two extreme states is very important and will help you avoid making errors or bad decisions that you will forever regret.
    -> The high price of ownership reveals three irrational quirks in human behavior - we are deeply attached to what we have; we often focus on what we may lose (also called Loss Aversion); we assume other people (or buyers of our goods) to also value the goods in the same manner as we do.
    -> People's expectations can cloud their thinking, and they use this as a marketing strategy to influence their friends' tastes and preferences.
    -> Price is so powerful that it can drive the Placebo Effect - the more the price, the more the utility you derive from the product. This phenomenon was explained with Aspirin - why a 50 cent Aspirin can do what a penny Aspirin can't.
    -> Trust is an important public resource and a necessary lubricant of the economy. A few bad players in the market can completely erode it.
    -> Why even the most morally upright person can be susceptible to making small crimes that hardly matter. However, a contemplation of moral behavior or a religious code of law before doing any action can greatly reduce the likelihood of people committing these petty crimes.
    -> The idea of FREE LUNCHES in behavior economics; the science of economics should be modified to account for how people actually behave instead of how they should behave in society.

    These are just some of the important principles explained in the book through experiments and startling revelations. It is easy to read and highly entertaining. However, there is one minor flaw in this book - the concepts and results described are all based on experiments performed on American college students or the western society, which may not be applicable to the more conservative societies in the world.

    BOTTOM LINE - Predictably Irrational is a wonderful book with new insights into irrational behavior in people. But for the one criticism, I believe this can change the way people think about economics, and can result in newer norms that account for our actual and not ideal behavior.

    PS: For people interested in reading more about behavior and cognitive sciences, I have the following book suggestions:
    1. "The Power of Habit: Why We Do What We Do in Life and Business" by Charles Duhigg.
    2. "Thinking, Fast and Slow" by Daniel Kahnem.
    3. "The Upside of Irrationality" by Dan Ariely.
    4. "The Signal and the Noise: Why So Many Predictions Fail -- but Some Don't" by Nate Silver
    41 people found this helpful
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  • Reviewed in the United States on December 31, 2012
    This was a fun book to read. It has been a while since I took any economics courses, and I forgot how much of economic theory is based on the assumption that humans are rational beings, always acting in their best interests. Dan Ariely does a marvelous job of shooting holes through that assumption.

    === The Good Stuff ===

    * The book is really an overview of behavioral economics- the study of how supposedly rational people make decisions. Ariely recounts numerous experiments in which people are given a challenge and react in ways which would seem to be exactly opposite of their self-interest. As an example, if you allow people the chance to buy $1 chocolate bars for 10 cents, they will purchase quite a few. But if you offer then 90 cent chocolates for free, they will only take one or two. If experiments like this interest you, you will enjoy the book.

    * In each case, Ariely describes a simple experiment, and provides a theory as to what he thinks happened. I have no idea how many of his theories are considered valid, or would stand up to peer review. But for a quick read to just amuse yourself with human nature, the explanations suffice.

    * Ariely picks a nice assortment of topics-everything from placebos to "irrational" pricing and honestly and ethics. The experiments are clever and "fun", although I doubt they would stand up to serious scientific scrutiny. Still, they were fun to read, and I will probably try some of them on my friends.

    === The Not So Good Stuff ===

    * While Ariely writes well, he is not the most engaging author you will read. The text comes across a little dry, and by the final chapters, I was ready for the book to end.

    * While the experiments, or at least their explanations were no doubt simplified for the book, in some cases they open more questions than they answer. Ariely offers one explanation and theory for the observed results, but makes no attempts to analyze deeper, or provide alternative explanations.

    * Without seeing more information, it is hard to tell if the experiments and their conclusions are statistically valid. In some cases it seems that they might not be, although given Ariely's background, it would seem he would know enough to assure the experiments validity.

    * Finally, there is no real theme or common thread through the work. Rather it is more like a series of short lab reports. The result is that the book can become tedious, and that it is tough to remember some of the results, as all the stories blur together.

    ===Summary===

    While there were some problems, I did enjoy the book, and found the material fascinating. Some of the experiments product results that were quite unexpected, and with a little thinking you can use some of this information into whatever your business or trade you operate in.

    I'd recommend the book, with the caveat that the book has some flaws. Still, the positives outweigh the negatives.
    12 people found this helpful
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Top reviews from other countries

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  • Daniel R.
    5.0 out of 5 stars Good book for salesmen
    Reviewed in the Netherlands on December 21, 2024
    Worth reading
  • vishal sehgal
    5.0 out of 5 stars Best human psychology book
    Reviewed in India on October 21, 2024
    This book will teach you how humans make decisions.
  • Andrik
    5.0 out of 5 stars great product
    Reviewed in Turkey on June 24, 2024
    it arrived a little late, guess its because of the holiday. despite that everything is okay.
  • Javier.
    5.0 out of 5 stars Excelente obra de economía del comportamiento.
    Reviewed in Mexico on August 2, 2020
    Una obra fundamental de uno de los mejores exponentes de la economía del comportamiento. Señala de manera clara y con varios ejemplos la manera en que los seres humanos se comportan en sus relaciones sociales y económicas, y por qué no es conveniente mezclar estas relaciones entre sí.
  • Cliente Kindle
    5.0 out of 5 stars Sensacional
    Reviewed in Brazil on July 17, 2020
    Livro que abre a mente, que faz pensar e nos mostra a realidade com outros olhos. A escrita é genial, divertida e altamente instigante! Vou ler outros do autor.