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Athanasius Artemyev
Athanasius Artemyev

Predictably Irrational: Dan Ariely's Fascinating and Fun Experiments on How We Think and Act

Predictably Irrational by Dan Ariely: A Book Review


Have you ever wondered why you make certain decisions that seem to defy logic and reason? Why do you buy things you don't need, pay more than you should, or procrastinate on important tasks? Why do you fall for marketing tricks, social pressures, or emotional impulses?

predictably irrational dan ariely pdf e-books 14

If you think you are always rational and smart, think again. In this book, Predictably Irrational, Dan Ariely reveals the hidden forces that shape our decisions and shows how we are often influenced by factors that we are not aware of or don't understand. He also explains how we can use this knowledge to make better choices and improve our lives.

What is Predictably Irrational?

Predictably Irrational is a term coined by Dan Ariely to describe the systematic and predictable ways that we deviate from rationality in our everyday behavior. He argues that we are not only irrational, but also consistently irrational, meaning that we make the same types of mistakes over and over again.

Through a series of clever and entertaining experiments, Ariely demonstrates how our irrationality affects various aspects of our lives, such as money, health, relationships, morality, and happiness. He also reveals the psychological mechanisms behind our irrational behavior, such as cognitive biases, heuristics, framing effects, anchoring effects, relativity, and social norms.

Who is Dan Ariely?

Dan Ariely is a professor of psychology and behavioral economics at Duke University. He is also a bestselling author, a TED speaker, a podcast host, and a co-founder of several companies and organizations that apply behavioral science to solve real-world problems.

Ariely was born in New York but grew up in Israel. When he was 18, he suffered a severe injury in an explosion that left him with third-degree burns over 70% of his body. He spent three years in a hospital recovering from his wounds and undergoing multiple surgeries. This experience sparked his interest in human behavior and decision making, especially under difficult and painful circumstances.

Ariely received his PhD in cognitive psychology from the University of North Carolina at Chapel Hill and his PhD in business administration from Duke University. He has taught at MIT, Stanford, Harvard, and Yale. He has published over 200 academic papers and six popular books, including The Upside of Irrationality, The Honest Truth About Dishonesty, Payoff, Dollars and Sense, Amazing Decisions, and The (Honest) Truth About Dishonesty.

Main Themes and Insights

In this book, Ariely covers a wide range of topics related to our irrational behavior. Here are some of the main themes and insights that he discusses:

The Power of FREE!

One of the most powerful forces that influence our decisions is the lure of FREE! We tend to overreact to anything that is offered for free, even if it is not valuable or useful to us. We also tend to ignore the hidden costs or trade-offs that come with free offers, such as time, effort, quality, or opportunity.

For example, Ariely conducted an experiment where he offered people a choice between a Hershey's Kiss for one cent and a Lindt truffle for 15 cents. Most people chose the truffle, as it was a better deal. However, when he lowered the prices by one cent, making the Kiss free and the truffle 14 cents, most people switched to the Kiss, even though the relative difference was the same.

Ariely explains that this is because we perceive free as a special price that has no downside or risk. We also associate free with positive emotions, such as happiness, excitement, or generosity. However, this can lead us to make irrational choices that are not in our best interest.

To avoid falling for the trap of free, Ariely suggests that we should always ask ourselves what we are giving up or losing when we accept a free offer. We should also compare the value of the free item with the value of other alternatives that are not free.

The Influence of Expectations and Emotions

Another factor that affects our decisions is our expectations and emotions. We tend to see what we expect to see and feel what we expect to feel, regardless of the objective reality. We also tend to let our emotions override our logic and reason, especially when we are aroused, angry, or stressed.

For example, Ariely conducted an experiment where he gave people a sip of beer that was secretly mixed with vinegar. He told half of them that it was a regular beer and the other half that it was a balsamic vinegar beer. He found that those who expected a regular beer disliked it more than those who expected a vinegar beer, even though they drank the same thing.

Ariely explains that this is because our expectations shape our perceptions and preferences. We tend to confirm our expectations by focusing on the information that supports them and ignoring the information that contradicts them. We also tend to adjust our tastes and opinions to match our expectations.

To avoid being influenced by our expectations and emotions, Ariely suggests that we should try to be more aware of them and question their validity. We should also seek out objective feedback and evidence that can challenge our assumptions and beliefs.

The Role of Social Norms and Fairness

A third factor that influences our decisions is our social norms and sense of fairness. We tend to follow the rules and expectations of our society and culture, even if they are not rational or optimal. We also tend to care about how others treat us and how we treat others, even if it means sacrificing our own interests or happiness.

For example, Ariely conducted an experiment where he asked people to perform a simple task for money. He found that people were willing to work harder for less money if they were paid in cash than if they were paid in gift certificates or chocolates. He also found that people were willing to work for free if they were asked as a favor rather than as a transaction.

Ariely explains that this is because we operate in two different modes: market norms and social norms. Market norms are based on monetary exchange and self-interest. Social norms are based on trust, reciprocity, and altruism. When we mix these two modes, we create confusion and resentment.

To avoid being confused by social norms and fairness, Ariely suggests that we should be clear about which mode we are in and stick to it. We should also be careful about how we frame our requests and offers, as they can trigger different responses from others.

The Cost of Procrastination and Self-Control

A fourth factor that affects our decisions is our procrastination and lack of self-control. We tend to delay or avoid doing things that are good for us in the long term but require effort or sacrifice in the short term. We also tend to give in to temptations that are bad for us in the long term but provide pleasure or relief in the short term.

For example, Ariely conducted an experiment where he gave students a choice between three options for completing three papers during a semester: Option A: submit all three papers on the last day of class; Option B: submit each paper on a pre-specified date; Option C: choose your own deadlines for each paper. He found that most students chose Option C, but they performed worse than those who chose Option B.

The Paradox of Choice and Happiness

A fifth factor that influences our decisions is our paradox of choice and happiness. We tend to prefer having more options and freedom to choose, but we also tend to feel overwhelmed and dissatisfied when we have too many options and choices. We also tend to regret our choices and compare them with what could have been or what others have.

For example, Ariely conducted an experiment where he offered people a choice between six different types of jams or chocolates. He found that people were more likely to buy something when they had fewer options than when they had more options. He also found that people were less happy with their purchase when they had more options than when they had fewer options.

Ariely explains that this is because we suffer from choice overload, which means that we have difficulty evaluating and comparing many alternatives. We also suffer from opportunity cost, which means that we feel the loss of the options we did not choose. We also suffer from counterfactual thinking, which means that we imagine how things could have been different if we had chosen differently.

To avoid being paralyzed by choice and happiness, Ariely suggests that we should limit our options and focus on the most important criteria. We should also appreciate what we have and avoid comparing ourselves with others or with hypothetical scenarios.


In this book, Ariely has shown us how we are predictably irrational in many aspects of our lives. He has also given us some tips and tools to overcome our irrationality and make better decisions. However, he does not claim that rationality is always superior or desirable. He acknowledges that irrationality can sometimes be beneficial, fun, or even necessary for our well-being.

Why You Should Read This Book

You should read this book if you want to learn more about yourself and others. You will discover how your mind works and why you do what you do. You will also gain a new perspective on human behavior and decision making. You will be surprised, amused, enlightened, and challenged by the stories and experiments that Ariely shares.

How to Apply the Lessons from This Book

You can apply the lessons from this book to improve your personal and professional life. You can use them to make smarter choices about money, health, relationships, morality, and happiness. You can also use them to understand and influence others better. You can also use them to have more fun and creativity in your life.


Where can I find predictably irrational dan ariely pdf e-books 14?

You can find predictably irrational dan ariely pdf e-books 14 online on various websites and platforms. However, you should be careful about the quality and legality of the sources you use. You should also respect the author's rights and support his work by buying his books or subscribing to his services.

What are some other books by Dan Ariely?

Some other books by Dan Ariely are: - The Upside of Irrationality: This book explores how irrationality can have positive effects on our motivation, performance, creativity, and happiness. - The Honest Truth About Dishonesty: This book examines how dishonesty affects our lives and society, and how we can reduce it. - Payoff: This book investigates how we can motivate ourselves and others in meaningful and sustainable ways. - Dollars and Sense: This book reveals how we think about money and how we can spend it more wisely. - Amazing Decisions: This book explains how we can make better decisions by using simple tools and techniques. - The (Honest) Truth About Dishonesty: This book is an updated version of The Honest Truth About Dishonesty, with new research and insights.

How can I learn more about behavioral economics?

You can learn more about behavioral economics by reading books, articles, blogs, podcasts, videos, courses, or programs that cover this topic. You can also follow or interact with experts, researchers, practitioners, or enthusiasts in this field. You can also conduct your own experiments or observations to test your own hypotheses or assumptions.

What are some examples of predictably irrational behavior in real life?

Some examples of predictably irrational behavior in real life are: - Buying things on sale that you don't need or want, just because they are cheap or free. - Leaving a bigger tip when paying with a credit card than with cash, because you don't feel the pain of paying. - Lying or cheating more when you are tired, hungry, or stressed, because you have less self-control. - Staying in a bad relationship, job, or investment, because you don't want to admit your mistake or lose what you have invested. - Choosing a default option or following the crowd, because you don't want to think too hard or stand out.

How can I overcome my own irrationality?

You can overcome your own irrationality by: - Being aware of your own biases, heuristics, emotions, and social influences, and how they affect your decisions. - Seeking out objective and reliable information and feedback that can challenge your beliefs and assumptions. - Using tools and techniques that can help you think more clearly and logically, such as lists, tables, charts, graphs, calculators, timers, reminders, etc. - Setting goals and plans that can help you overcome your procrastination and self-control problems, such as deadlines, rewards, punishments, commitments, etc. - Experimenting with different options and scenarios that can help you discover your true preferences and values. 71b2f0854b


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