The Art of Thinking Clearly by Rolf Dobelli Book Summary
                     The Art of Thinking Clearly by Rolf Dobelli: Book Summary 
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Chapter 1: Why You Should Visit Cemeteries: Survivorship Bias 
Summary: 
This chapter explains Survivorship Bias, where we focus on successful individuals or 
entities while ignoring those that failed. This leads to an overestimation of the likelihood of 
success. By acknowledging failures, we gain a more realistic perspective on what strategies 
lead to success. 
Key Insights: 
• Success stories are more visible than failures, leading to a skewed perception. 
• Acknowledging failures provides a more realistic understanding of success. 
• Avoid making decisions based solely on success stories without considering the 
failures. 
 
Chapter 2: Does Harvard Make You Smarter?: Swimmer’s Body Illusion 
Summary: 
The Swimmer’s Body Illusion is when we confuse selection factors with results. Dobelli 
uses examples like top universities and professional athletes to show that often, the attributes 
that lead to selection are mistaken for the outcomes of training or education. 
Key Insights: 
• Selection factors are often mistaken for results. 
• Recognize inherent qualities versus those developed through training. 
• Critical evaluation of success factors is necessary for informed decisions. 
 
Chapter 3: Why You See Shapes in the Clouds: Clustering Illusion 
Summary: 
The Clustering Illusion refers to the tendency to see patterns in random events. This 
cognitive bias is evident in situations like stock market fluctuations and gambling, where 
people mistakenly believe in patterns that are merely coincidental. 
Key Insights: 
• Random events often appear to form patterns. 
• Recognizing the clustering illusion helps in making objective decisions. 
• Avoid over-interpreting data without statistical analysis. 
 
Chapter 4: If 50 Million People Say Something Foolish, It Is Still Foolish: 
Social Proof 
Summary: 
Social Proof is the phenomenon where individuals follow the behavior of the masses, 
believing it to be correct. This herd behavior can lead to poor decisions, as seen in market 
bubbles or social trends. 
Key Insights: 
• Herd behavior can lead to significant mistakes. 
• Independent thinking is crucial to avoid the pitfalls of Social Proof. 
• Recognizing the influence of others on our decisions can improve our judgment. 
 
Chapter 5: Why You Should Forget the Past: Sunk Cost Fallacy 
Summary: 
The Sunk Cost Fallacy involves continuing an endeavor based on past investments of time, 
money, or effort rather than current and future benefits. By focusing on future prospects 
rather than past investments, we can make more rational decisions. 
Key Insights: 
• Past investments should not influence current decisions. 
• Evaluating future benefits is essential for rational decision-making. 
• Awareness of the sunk cost fallacy can prevent ongoing poor investments. 
 
Chapter 6: Don’t Accept Free Drinks: Reciprocity 
Summary: 
Reciprocity is a powerful social norm where receiving a favor creates an obligation to return 
it. This principle is widely used in marketing and interpersonal relationships to influence 
behavior. 
Key Insights: 
• Reciprocity creates a strong sense of obligation. 
• Awareness of this bias helps in maintaining autonomy. 
• Critical evaluation of favors can prevent manipulation. 
 
Chapter 7: Beware the ‘Special Case’: Confirmation Bias (Part 1) 
Summary: 
Confirmation Bias is the tendency to search for, interpret, and remember information that 
confirms our preconceptions while ignoring or dismissing evidence that contradicts them. 
This bias affects decision-making in various fields, including science, business, and personal 
beliefs. 
Key Insights: 
• Confirmation bias distorts our perception of reality. 
• Seeking disconfirming evidence is crucial for objective thinking. 
• Awareness of this bias improves decision-making. 
 
Chapter 8: Murder Your Darlings: Confirmation Bias (Part 2) 
Summary: 
Building on the previous chapter, this section emphasizes the importance of challenging our 
cherished beliefs and assumptions. By "murdering our darlings," or letting go of beloved but 
flawed ideas, we can achieve clearer thinking and better decision-making. 
Key Insights: 
• Holding onto cherished beliefs despite contradictory evidence can hinder progress. 
• Challenging cherished beliefs leads to better decisions. 
• Objective evaluation of all evidence is essential. 
 
Chapter 9: Don’t Bow to Authority: Authority Bias 
Summary: 
Authority Bias occurs when we place undue trust in the opinions of authority figures, 
regardless of the merit of their advice. This bias can lead to poor decisions in areas such as 
business, healthcare, and personal life. 
Key Insights: 
• Authority bias can lead to poor decisions. 
• Independent evaluation of advice is crucial. 
• Questioning authority improves judgment. 
 
Chapter 10: Leave Your Supermodel Friends at Home: Contrast Effect 
Summary: 
The Contrast Effect influences our perceptions by comparing things to contrasting 
alternatives. This bias affects various decisions, from evaluating job candidates to making 
purchases. 
Key Insights: 
• The contrast effect distorts our perceptions. 
• Awareness of this bias helps in making objective decisions. 
• Contextual evaluation is crucial for accurate judgment. 
 
Chapter 11: Why We Prefer a Wrong Map to No Map at All: Availability 
Bias 
Summary: 
Availability Bias is the tendency to overestimate the importance of information that is 
readily available to us. This bias leads us to make decisions based on information that is 
easily recalled, rather than on a comprehensive analysis of all relevant data. 
Key Insights: 
• Availability bias leads to overestimating the importance of readily available 
information. 
• Seeking out a broad range of data helps in making informed decisions. 
• Considering less accessible information provides a more accurate understanding of 
risks. 
 
Chapter 12: Why ‘No Pain, No Gain’ Should Set Alarm Bells Ringing: The 
It’ll-Get-Worse-Before-It-Gets-Better Fallacy 
Summary: 
The "It’ll-Get-Worse-Before-It-Gets-Better" fallacy is a cognitive bias where people believe 
that initial negative outcomes will eventually lead to positive results. Dobelli discusses how 
this fallacy can be used to justify poor decisions and prolong detrimental actions. 
Key Insights: 
• The "It’ll-Get-Worse-Before-It-Gets-Better" fallacy can justify poor decisions. 
• Critical evaluation of expected improvements is necessary to avoid unnecessary 
suffering. 
• Making decisions based on evidence rather than wishful thinking leads to better 
outcomes. 
 
Chapter 13: Even True Stories Are Fairytales: Story Bias 
Summary: 
Story Bias is the tendency to create coherent narratives from random or unrelated events. 
This bias leads us to oversimplify complex situations and make decisions based on appealing 
but inaccurate stories. 
Key Insights: 
• Story bias leads to oversimplifying complex situations through coherent narratives. 
• Recognizing the limitations of stories helps in making informed decisions. 
• Focusing on factual analysis rather than appealing narratives improves judgment. 
 
Chapter 14: Why You Should Keep a Diary: Hindsight Bias 
Summary: 
Hindsight Bias is the tendency to see events as having been predictable after they have 
already occurred. This bias can distort our understanding of past events and lead to 
overconfidence in our predictive abilities. 
Key Insights: 
• Hindsight bias distorts our understanding of past events by making them seem 
predictable. 
• Keeping a diary helps track our thoughts and predictions in real-time. 
• Recognizing the limitations of our foresight leads to more realistic assessments. 
 
Chapter 15: Why You Systematically Overestimate Your Knowledge and 
Abilities: Overconfidence Effect 
Summary: 
The Overconfidence Effect is the tendency to overestimate our knowledge, skills, and 
accuracy of predictions. Dobelli illustrates how overconfidence can lead to disastrous 
consequences in various domains, such as business, investing, and everyday life. 
Key Insights: 
• Overconfidence leads to overestimating our knowledge and abilities. 
• Experts are particularly susceptible to overconfidence. 
• Humility and continuous learning can mitigate the effects of overconfidence. 
 
Chapter 16: Don’t Take News Anchors Seriously: Chauffeur Knowledge 
Summary: 
Chauffeur Knowledge is the difference between real knowledge and the mere appearance of 
knowledge. Dobelli uses the metaphor of a chauffeur delivering a Nobel Prize-winning 
physicist's speech to illustrate this difference. 
Key Insights: 
• Chauffeur knowledge is superficial and lacks deep understanding. 
• Critical evaluation of expertise is necessary to avoid being misled. 
• Seek information from those with genuine knowledge and understanding. 
 
Chapter 17: You Control Less Than You Think: Illusion of Control 
Summary: 
The Illusion of Control is the tendency to believe we have more control over events than we 
actually do. Dobelli discusses how this bias can lead to overestimating our influence in 
various situations, from gambling to business decisions. 
Key Insights: 
• The illusion of control leads to overestimating our influence over events. 
• Recognizing the limits of our control helps in making rational decisions. 
• Focus on areas where you can genuinely make a difference. 
 
Chapter 18: Never Pay Your Lawyer by the Hour: Incentive Super-Response 
Tendency 
Summary: 
Dobelli explores how incentives shape behavior, often leading to unintended consequences. 
He uses examples from various professions, such as law and healthcare, to show how 
incentive structures can lead to suboptimal outcomes. 
Key Insights: 
• Incentives shape behavior and can lead to unintended consequences. 
• Misaligned incentives can result in suboptimal outcomes. 
• Aligning incentives with desired outcomes promotes efficient and effective behavior. 
 
Chapter 19: The Dubious Efficacy of Doctors, Consultants, and 
Psychotherapists: Regression to the Mean 
Summary: 
Regression to the Mean is a statistical phenomenon where extreme outcomes are likely to be 
followed by more moderate ones. Dobelli explains how this concept can lead to 
misattributions of cause and effect, especially in fields like medicine, consulting, and 
psychology. 
Key Insights: 
• Regression to the mean is a statistical phenomenon affecting extreme outcomes. 
• Misattributions of cause and effect can result from this concept. 
• Recognize natural fluctuations to avoid incorrect conclusions. 
 
Chapter 20: Never Judge a Decision by Its Outcome: Outcome Bias 
Summary: 
Outcome Bias involves judging the quality of a decision based on its outcome rather than the 
decision-making process. Dobelli argues that focusing on the decision-making process rather 
than outcomes leads to better judgments. 
Key Insights: 
• Outcome bias involves judging decisions based on outcomes rather than the process. 
• Successful outcomes do not always indicate good decisions. 
• Focus on the decision-making process to improve judgment and avoid outcome bias. 
 
Chapter 21: Less Is More: The Paradox of Choice 
Summary: 
Dobelli discusses the Paradox of Choice, where having too many options can lead to 
decision paralysis and dissatisfaction. He suggests simplifying decisions by reducing the 
number of options to a manageable level. 
Key Insights: 
• The paradox of choice occurs when too many options lead to decision paralysis. 
• An abundance of choices can cause overwhelm and regret. 
• Simplifying decisions by reducing options can improve satisfaction and reduce stress. 
 
Chapter 22: You Like Me, You Really Really Like Me: Liking Bias 
Summary: 
The Liking Bias refers to the tendency to favor people we like and to be more easily 
persuaded by them. This bias can influence decisions in contexts such as hiring, politics, and 
personal relationships. 
Key Insights: 
• Liking bias leads us to favor and be persuaded by people we like. 
• This bias can cloud judgment and lead to biased decisions. 
• Separating personal feelings from professional judgments helps in making fair and 
rational decisions. 
 
Chapter 23: Don’t Cling to Things: Endowment Effect 
Summary: 
The Endowment Effect describes our tendency to overvalue things simply because we own 
them. Dobelli explains how this bias can lead to irrational decisions in various areas, such as 
investments and possessions. 
Key Insights: 
• The endowment effect leads us to overvalue things we own. 
• This bias can result in irrational decisions about investments and possessions. 
• Evaluating possessions objectively helps in making rational decisions about what to 
keep and what to let go of. 
 
Chapter 24: The Inevitability of Unlikely Events: Coincidence 
Summary: 
Dobelli discusses the nature of coincidences and how we tend to see meaning in random 
events. He explains that unlikely events are inevitable in large populations and that our brains 
are wired to find patterns and significance in these events. 
Key Insights: 
• Coincidences are inevitable in large populations. 
• Our brains are wired to find patterns and significance in random events. 
• Understanding the mathematical reality of coincidences helps in making rational 
decisions. 
 
Chapter 25: The Calamity of Conformity: Groupthink 
Summary: 
Groupthink is a phenomenon where the desire for harmony and conformity within a group 
leads to irrational or dysfunctional decision-making. Dobelli illustrates how groupthink can 
stifle dissent, suppress critical thinking, and result in poor decisions. 
Key Insights: 
• Groupthink leads to irrational and dysfunctional decision-making. 
• Conformity stifles dissent and critical thinking. 
• Encouraging diverse perspectives and open dialogue helps combat groupthink and 
improve decision-making. 
 
Chapter 26: Why You’ll Soon Be Playing Megatrillions: Neglect of 
Probability 
Summary: 
Dobelli discusses how people often Neglect Probabilities when making decisions, leading to 
irrational choices. He explains that we tend to focus on potential outcomes rather than the 
likelihood of those outcomes occurring. 
Key Insights: 
• Neglect of probability leads to irrational decision-making. 
• People focus on potential outcomes rather than their likelihood. 
• Incorporating probability into decision-making helps make informed and rational 
choices. 
 
Chapter 27: Why the Last Cookie in the Jar Makes Your Mouth Water: 
Scarcity Error 
Summary: 
The Scarcity Error is the cognitive bias where we perceive items or opportunities as more 
valuable when they are scarce. This bias influences decisions by making us more likely to 
desire and pursue things that are limited in availability. 
Key Insights: 
• The scarcity error leads us to overvalue items or opportunities that are scarce. 
• Scarcity tactics can manipulate our perception of value. 
• Evaluating the true value of items objectively helps in making rational decisions. 
 
Chapter 28: When You Hear Hooofbeats, Don’t Expect a Zebra: Base-Rate 
Neglect 
Summary: 
Base-Rate Neglect occurs when we ignore general statistical information (base rates) in 
favor of specific information. Dobelli explains how this bias leads to faulty judgments and 
decisions by focusing on anecdotal or vivid information rather than statistical reality. 
Key Insights: 
• Base-rate neglect leads to faulty judgments by ignoring general statistical information. 
• Anecdotal or vivid information can overshadow statistical reality. 
• Incorporating base rates into decision-making improves accuracy and avoids bias. 
 
Chapter 29: Why the ‘Balancing Force of the Universe’ Is Baloney: 
Gambler’s Fallacy 
Summary: 
The Gambler’s Fallacy is the belief that past random events can influence the likelihood of 
future random events. Dobelli explains how this fallacy leads to irrational decisions in 
gambling and other areas of life. 
Key Insights: 
• The gambler’s fallacy leads to irrational decisions by believing past random events 
influence future ones. 
• Each event in a random sequence is independent of past events. 
• Understanding the nature of randomness helps in making rational decisions. 
 
Chapter 30: Why the Wheel of Fortune Makes Our Heads Spin: The Anchor 
Summary: 
Anchoring is a cognitive bias where we rely too heavily on the first piece of information (the 
"anchor") when making decisions. This bias can influence various decisions, such as pricing, 
negotiations, and judgments. 
Key Insights: 
• Anchoring leads to over-reliance on the first piece of information when making 
decisions. 
• The initial information can influence subsequent judgments and decisions. 
• Questioning the anchor and considering a range of information helps in making 
balanced decisions. 
 
Chapter 31: How to Relieve People of Their Millions: Induction 
Summary: 
Induction involves drawing general conclusions based on specific observations. Dobelli 
explains how induction can lead to faulty conclusions when the observed sample is not 
representative. 
Key Insights: 
• Induction involves drawing general conclusions from specific observations. 
• Limited or unrepresentative samples can lead to faulty conclusions. 
• Seeking larger and more representative samples improves the accuracy of 
generalizations. 
 
Chapter 32: Why Evil Strikes Harder Than Good: Loss Aversion 
Summary: 
Loss Aversion is the tendency to prefer avoiding losses over acquiring equivalent gains. This 
bias influences risk-averse behavior and various decisions, such as investments and 
negotiations. 
Key Insights: 
• Loss aversion leads to preferring avoiding losses over acquiring equivalent gains. 
• This bias influences risk-averse behavior and various decisions. 
• Recognizing the impact of loss aversion helps in making balanced and rational 
decisions. 
 
Chapter 33: Why Teams Are Lazy: Social Loafing 
Summary: 
Social Loafing is the tendency for individuals to put in less effort when working in a group 
compared to when working alone. Dobelli explains how this bias can lead to decreased 
productivity and accountability in team settings. 
Key Insights: 
• Social loafing leads to reduced effort and productivity in group settings. 
• Enhancing individual accountability and motivation can mitigate social loafing. 
• Clear roles and individual goals improve team performance. 
 
Chapter 34: Stumped by a Sheet of Paper: Exponential Growth 
Summary: 
Dobelli discusses the concept of Exponential Growth, where quantities increase at a 
constantly accelerating rate. He explains how people often underestimate the power of 
exponential growth, leading to flawed predictions and decisions. 
Key Insights: 
• Exponential growth involves quantities increasing at an accelerating rate. 
• People often underestimate the power of exponential growth. 
• Understanding exponential growth helps in making better predictions and decisions. 
 
Chapter 35: Curb Your Enthusiasm: Winner’s Curse 
Summary: 
The Winner’s Curse refers to the phenomenon where the winner of an auction or 
competitive bidding process often overpays for the item. Dobelli explains how this bias 
occurs due to over-enthusiasm and competition, leading to irrational decisions. 
Key Insights: 
• The winner’s curse occurs when over-enthusiasm and competition lead to overpaying. 
• Caution and critical evaluation help in avoiding the winner’s curse. 
• Setting clear limits and avoiding over-enthusiasm lead to more rational decisions. 
 
Chapter 36: Never Ask a Writer If the Novel Is Autobiographical: 
Fundamental Attribution Error 
Summary: 
Fundamental Attribution Error is the tendency to attribute others’ actions to their character 
while attributing our actions to external circumstances. Dobelli illustrates how this bias leads 
to misjudgments and misunderstandings in personal and professional relationships. 
Key Insights: 
• Fundamental attribution error involves attributing others’ actions to their character 
and our actions to external circumstances. 
• This bias leads to misjudgments and misunderstandings. 
• Considering both internal and external factors improves the accuracy of our 
judgments about others. 
 
Chapter 37: Why You Shouldn’t Believe in the Stork: False Causality 
Summary: 
False Causality is the tendency to perceive a cause-and-effect relationship between unrelated 
events. Dobelli explains how this bias can lead to incorrect conclusions and decisions. 
Key Insights: 
• False causality involves perceiving cause-and-effect relationships between unrelated 
events. 
• This bias can lead to incorrect conclusions and decisions. 
• Being critical of perceived causality and seeking evidence helps in making informed 
decisions. 
 
Chapter 38: Everyone Is Beautiful at the Top: Halo Effect 
Summary: 
The Halo Effect is the tendency to let our overall impression of a person influence our 
judgments about their specific traits or abilities. Dobelli explains how this bias can lead to 
distorted evaluations in various contexts, such as hiring, performance reviews, and social 
interactions. 
Key Insights: 
• The halo effect involves letting overall impressions influence judgments about 
specific traits or abilities. 
• This bias leads to distorted evaluations and decisions. 
• Separating overall impressions from specific evaluations helps in making fairer and 
more accurate assessments. 
 
Chapter 39: Congratulations! You’ve Won Russian Roulette: Alternative 
Paths 
Summary: 
Dobelli discusses the importance of considering Alternative Paths when evaluating 
outcomes. He explains how people often focus on the actual outcome without considering 
what could have happened if different decisions were made. 
Key Insights: 
• Considering alternative paths helps in evaluating outcomes more realistically. 
• Focusing only on actual outcomes can lead to overestimating skill and 
underestimating luck. 
• Recognizing the potential impact of different decisions improves the accuracy of 
success and failure assessments. 
 
Chapter 40: False Prophets: Forecast Illusion 
Summary: 
The Forecast Illusion involves overestimating the accuracy of predictions and forecasts. 
Dobelli explains how this bias leads to misplaced confidence in predictions about the future, 
whether in finance, weather, or other areas. 
Key Insights: 
• The forecast illusion involves overestimating the accuracy of predictions. 
• Misplaced confidence in forecasts can lead to poor decisions. 
• Skepticism towards forecasts and reliance on evidence-based decision-making 
improves judgment. 
 
Chapter 41: The Deception of Specific Cases: Conjunction Fallacy 
Summary: 
The Conjunction Fallacy is the tendency to believe that specific conditions are more 
probable than general ones. Dobelli explains how this bias leads to incorrect assessments of 
probability and risk. 
Key Insights: 
• The conjunction fallacy involves believing that specific conditions are more probable 
than general ones. 
• This bias leads to incorrect assessments of probability and risk. 
• Focusing on base rates and general probabilities helps in making more accurate 
assessments. 
 
Chapter 42: It’s Not What You Say, But How You Say It: Framing 
Summary: 
Framing refers to the way information is presented, which can significantly influence our 
decisions and judgments. Dobelli illustrates how different framings of the same information 
can lead to different conclusions and actions. 
Key Insights: 
• Framing influences our decisions and judgments based on how information is 
presented. 
• Different framings of the same information can lead to different conclusions. 
• Focusing on the underlying information helps in making objective and rational 
decisions. 
 
Chapter 43: Why Watching and Waiting Is Torture: Action Bias 
Summary: 
Action Bias is the tendency to prefer action over inaction, even when doing nothing is the 
better choice. Dobelli explains how this bias can lead to unnecessary or harmful actions, 
especially in situations of uncertainty. 
Key Insights: 
• Action bias leads to a preference for action over inaction, even when inaction is 
better. 
• This bias can result in unnecessary or harmful actions. 
• Considering the value of inaction and evaluating potential outcomes leads to more 
effective decisions. 
 
Chapter 44: Why You Are Either the Solution – Or the Problem: Omission 
Bias 
Summary: 
Omission Bias is the tendency to judge harmful actions as worse than equally harmful 
inactions. Dobelli explains how this bias leads us to undervalue the impact of inaction, even 
when it can have significant consequences. 
Key Insights: 
• Omission bias leads to judging harmful actions as worse than equally harmful 
inactions. 
• This bias undervalues the impact of inaction. 
• Recognizing the impact of inaction and considering it equally with action leads to 
balanced and ethical decisions. 
 
Chapter 45: Don’t Blame Me: Self-Serving Bias 
Summary: 
Self-Serving Bias is the tendency to attribute our successes to internal factors and our 
failures to external factors. Dobelli explains how this bias can distort our self-perception and 
lead to unfair evaluations of others. 
Key Insights: 
• Self-serving bias leads to attributing successes to internal factors and failures to 
external factors. 
• This bias distorts self-perception and evaluations of others. 
• Striving for a balanced perspective improves self-awareness and fairness in 
evaluations. 
 
Chapter 46: Be Careful What You Wish For: Hedonic Treadmill 
Summary: 
The Hedonic Treadmill refers to the tendency of individuals to return to a baseline level of 
happiness despite major positive or negative events. Dobelli explains how this phenomenon 
can lead to a perpetual pursuit of happiness through external achievements, which often fails 
to provide lasting satisfaction. 
Key Insights: 
• The hedonic treadmill leads to a return to a baseline level of happiness despite major 
events. 
• External achievements often fail to provide lasting satisfaction. 
• Focusing on internal factors and long-term goals leads to sustained fulfillment. 
 
Chapter 47: Do Not Marvel at Your Existence: Self-Selection Bias 
Summary: 
Self-Selection Bias occurs when individuals select themselves into a group, leading to a non-
representative sample. Dobelli explains how this bias can distort research findings, surveys, 
and general perceptions. 
Key Insights: 
• Self-selection bias leads to non-representative samples and distorted perceptions. 
• Research findings and surveys can be skewed by self-selection. 
• Seeking representative samples improves the accuracy of assessments and 
conclusions. 
 
Chapter 48: Why Experience Can Damage Our Judgment: Association Bias 
Summary: 
Association Bias is the tendency to link unrelated events based on coincidental occurrences. 
Dobelli explains how this bias can lead to superstitions and incorrect judgments. 
Key Insights: 
• Association bias leads to linking unrelated events based on coincidences. 
• This bias can result in superstitions and incorrect judgments. 
• Being critical of associations and seeking evidence helps in making rational decisions. 
 
Chapter 49: Be Wary When Things Get Off to a Great Start: Beginner’s Luck 
Summary: 
Beginner’s Luck refers to the initial success of novices, which can lead to overconfidence 
and unrealistic expectations. Dobelli explains how this phenomenon can distort our 
perception of skill and risk. 
Key Insights: 
• Beginner’s luck can lead to overconfidence and unrealistic expectations. 
• Early success is often due to chance rather than skill. 
• Maintaining humility and continuing to learn helps avoid overconfidence and make 
sustainable decisions. 
 
Chapter 50: Sweet Little Lies: Cognitive Dissonance 
Summary: 
Cognitive Dissonance is the mental discomfort experienced when holding two conflicting 
beliefs or when behavior contradicts beliefs. Dobelli explains how this bias leads individuals 
to rationalize their actions or change their beliefs to reduce discomfort. 
Key Insights: 
• Cognitive dissonance causes mental discomfort due to conflicting beliefs or 
behaviors. 
• This bias leads to rationalizations or changes in beliefs to reduce discomfort. 
• Striving for consistency between beliefs and actions leads to more honest and rational 
decisions. 
 
Chapter 51: Live Each Day as If It Were Your Last – But Only on Sundays: 
Hyperbolic Discounting 
Summary: 
Hyperbolic Discounting is the tendency to prefer smaller, immediate rewards over larger, 
future rewards. Dobelli explains how this bias leads to impulsive decisions and short-term 
thinking. 
Key Insights: 
• Hyperbolic discounting leads to preferring immediate rewards over future rewards. 
• This bias results in impulsive decisions and short-term thinking. 
• Recognizing hyperbolic discounting and prioritizing long-term goals leads to more 
prudent decisions. 
 
Chapter 52: Any Lame Excuse: ‘Because’ Justification 
Summary: 
Dobelli discusses the ‘Because’ Justification, where people are more likely to comply with a 
request if it is accompanied by a reason, even if the reason is weak. 
Key Insights: 
• The ‘Because’ Justification increases compliance with requests when accompanied by 
a reason. 
• Weak reasons can still lead to higher compliance. 
• Being critical of provided reasons and evaluating their validity helps in making 
deliberate decisions. 
 
Chapter 53: Decide Better – Decide Less: Decision Fatigue 
Summary: 
Decision Fatigue occurs when the quality of decisions deteriorates after a long session of 
decision-making. Dobelli explains how this phenomenon can lead to poor choices and 
impulsive actions. 
Key Insights: 
• Decision fatigue leads to deteriorating decision quality after prolonged decision-
making. 
• This phenomenon can result in poor choices and impulsive actions. 
• Minimizing daily decisions and prioritizing important ones when most alert improves 
decision quality. 
 
Chapter 54: Would You Wear Hitler’s Sweater?: Contagion Bias 
Summary: 
Contagion Bias is the irrational preference to avoid objects or ideas associated with negative 
individuals or events. Dobelli explains how this bias can lead to decisions based on 
associations rather than rational evaluation. 
Key Insights: 
• Contagion bias leads to avoiding objects or ideas associated with negative individuals 
or events. 
• This bias results in decisions based on associations rather than rational evaluation. 
• Focusing on intrinsic qualities and objective criteria helps in making rational choices. 
 
Chapter 55: Why There Is No Such Thing as an Average War: The Problem 
with Averages 
Summary: 
Dobelli discusses the limitations of using Averages to understand complex phenomena. He 
explains how averages can be misleading when they fail to account for variability and 
outliers. 
Key Insights: 
• Averages can be misleading when they fail to account for variability and outliers. 
• The average income might not reflect income disparity within a population. 
• Being cautious with averages and considering the full distribution of data improves 
accuracy in assessments. 
 
Chapter 56: How Bonuses Destroy Motivation: Motivation Crowding 
Summary: 
Motivation Crowding occurs when external incentives undermine intrinsic motivation. 
Dobelli explains how offering bonuses or rewards for tasks that people already find 
intrinsically rewarding can reduce their motivation and enjoyment. 
Key Insights: 
• Motivation crowding occurs when external incentives undermine intrinsic motivation. 
• Bonuses and rewards can reduce motivation and enjoyment for intrinsically rewarding 
tasks. 
• Balancing external incentives with intrinsic motivation creates more effective 
incentive systems. 
 
Chapter 57: If You Have Nothing to Say, Say Nothing: Twaddle Tendency 
Summary: 
Twaddle Tendency refers to the inclination to fill silence with meaningless talk or 
information. Dobelli explains how this bias can lead to wasted time and reduced productivity. 
Key Insights: 
• Twaddle tendency leads to filling silence with meaningless talk or information. 
• This bias can result in wasted time and reduced productivity. 
• Embracing silence and speaking only when meaningful improves communication and 
time management. 
 
Chapter 58: How to Increase the Average IQ of Two States: Will Rogers 
Phenomenon 
Summary: 
The Will Rogers Phenomenon occurs when moving an element from one group to another 
increases the average of both groups. Dobelli explains how this phenomenon can lead to 
misleading statistics and interpretations. 
Key Insights: 
• The Will Rogers Phenomenon occurs when moving an element increases the average 
of both groups. 
• This phenomenon can lead to misleading statistics and interpretations. 
• Being aware of the Will Rogers Phenomenon and critically evaluating statistical 
changes helps in avoiding misleading conclusions. 
 
Chapter 59: If You Have an Enemy, Give Him Information: Information Bias 
Summary: 
Information Bias is the tendency to seek information even when it does not affect decisions. 
Dobelli explains how this bias can lead to information overload and analysis paralysis. 
Key Insights: 
• Information bias leads to seeking information that does not affect decisions. 
• This bias can result in information overload and analysis paralysis. 
• Focusing on relevant information and avoiding unnecessary data improves decision-
making efficiency. 
 
Chapter 60: Hurts So Good: Effort Justification 
Summary: 
Effort Justification is the tendency to attribute greater value to outcomes that require 
significant effort. Dobelli explains how this bias can lead to overvaluing tasks or goals simply 
because they were hard to achieve. 
Key Insights: 
• Effort justification leads to attributing greater value to outcomes that require 
significant effort. 
• This bias can result in overvaluing tasks or goals simply because they were hard to 
achieve. 
• Evaluating outcomes based on their true value rather than effort involved leads to 
more rational decisions. 
 
Chapter 61: Why Small Things Loom Large: The Law of Small Numbers 
Summary: 
The Law of Small Numbers refers to the tendency to draw broad conclusions from small 
samples. Dobelli explains how this bias can lead to incorrect generalizations and decisions. 
Key Insights: 
• The law of small numbers leads to drawing broad conclusions from small samples. 
• This bias can result in incorrect generalizations and decisions. 
• Being cautious with small samples and seeking larger datasets improves the accuracy 
of conclusions. 
 
Chapter 62: Handle With Care: Expectations 
Summary: 
Dobelli discusses how Expectations influence our perceptions and experiences. He explains 
how high expectations can lead to disappointment, while low expectations can result in 
pleasant surprises. 
Key Insights: 
• Expectations significantly influence perceptions and experiences. 
• High expectations can lead to disappointment, while low expectations can result in 
pleasant surprises. 
• Managing expectations to align with reality reduces disappointment and increases 
satisfaction. 
 
Chapter 63: Speed Traps Ahead!: Simple Logic 
Summary: 
Dobelli emphasizes the importance of Simple Logic in decision-making. He explains how 
complex situations often have straightforward solutions, and overcomplicating them can lead 
to confusion and poor decisions. 
Key Insights: 
• Simple logic is crucial for effective decision-making. 
• Overcomplicating situations can lead to confusion and poor decisions. 
• Applying simple logic and focusing on fundamental principles improves clarity and 
decision-making. 
 
Chapter 64: How to Expose a Charlatan: Forer Effect 
Summary: 
The Forer Effect is the tendency to accept vague and general statements as uniquely 
applicable to oneself. Dobelli explains how this bias makes people susceptible to horoscopes, 
personality tests, and other pseudosciences. 
Key Insights: 
• The Forer Effect leads to accepting vague and general statements as uniquely 
applicable to oneself. 
• This bias makes people susceptible to horoscopes, personality tests, and 
pseudosciences. 
• Being critical of general statements and seeking specific, evidence-based information 
helps in avoiding misleading claims. 
 
Chapter 65: Volunteer Work Is for the Birds: Volunteer’s Folly 
Summary: 
Volunteer’s Folly is the tendency to overestimate the impact of volunteer work and 
underappreciate the importance of specialized skills and professional expertise. Dobelli 
explains how this bias can lead to misplaced efforts and inefficiencies. 
Key Insights: 
• Volunteer’s folly involves overestimating the impact of volunteer work and 
underappreciating specialized skills. 
• Misplaced efforts and inefficiencies can result from this bias. 
• Recognizing the value of specialized skills and contributing accordingly improves 
impact. 
 
Chapter 66: Why You Are a Slave to Your Emotions: Affect Heuristic 
Summary: 
The Affect Heuristic is the tendency to let emotions influence our decisions and judgments. 
Dobelli explains how this bias can lead to irrational choices based on emotional reactions 
rather than objective analysis. 
Key Insights: 
• The affect heuristic leads to decisions and judgments influenced by emotions. 
• This bias can result in irrational choices based on emotional reactions. 
• Separating emotions from decision-making and focusing on objective criteria leads to 
more rational choices. 
 
Chapter 67: Be Your Own Heretic: Introspection Illusion 
Summary: 
Introspection Illusion is the tendency to believe we understand our own minds and 
motivations better than we actually do. Dobelli explains how this bias can lead to 
overconfidence in our self-knowledge and poor decisions based on flawed self-assessments. 
Key Insights: 
• Introspection illusion leads to overconfidence in self-knowledge and flawed self-
assessments. 
• This bias can result in poor decisions based on incorrect self-perceptions. 
• Being skeptical of introspection and seeking external feedback improves self-
awareness and decision-making. 
 
Chapter 68: Why You Should Set Fire to Your Ships: Inability to Close Doors 
Summary: 
Inability to Close Doors is the tendency to keep options open, even when it leads to 
suboptimal decisions. Dobelli explains how this bias can result in indecision and wasted 
resources. 
Key Insights: 
• Inability to close doors leads to keeping options open, resulting in indecision and 
wasted resources. 
• This bias can prevent focusing on more rewarding paths. 
• Committing to decisions and closing unnecessary options improves focus and 
decision-making. 
 
Chapter 69: Disregard the Brand New: Neomania 
Summary: 
Neomania is the obsession with novelty and the tendency to prefer new over established 
options. Dobelli explains how this bias can lead to irrational decisions, such as constantly 
upgrading to the latest technology without considering its actual benefits. 
Key Insights: 
• Neomania involves an obsession with novelty and a preference for new options. 
• This bias can lead to irrational decisions and unnecessary expenditures. 
• Evaluating new options critically and considering their real value leads to more 
rational choices. 
 
Chapter 70: Why Propaganda Works: Sleeper Effect 
Summary: 
The Sleeper Effect is the tendency for persuasive messages to become more influential over 
time, even if initially dismissed. Dobelli explains how this bias can make propaganda and 
misleading information more effective in the long run. 
Key Insights: 
• The sleeper effect leads to persuasive messages becoming more influential over time. 
• This bias makes propaganda and misleading information more effective in the long 
run. 
• Being critical of persuasive messages and considering their sources helps guard 
against the sleeper effect. 
 
Chapter 71: Why It’s Never Just a Two-Horse Race: Alternative Blindness 
Summary: 
Alternative Blindness is the tendency to consider only a limited number of options, 
overlooking other possibilities. Dobelli explains how this bias can lead to suboptimal 
decisions by ignoring viable alternatives. 
Key Insights: 
• Alternative blindness leads to considering only a limited number of options. 
• This bias can result in suboptimal decisions by overlooking viable alternatives. 
• Expanding the range of options and seeking overlooked alternatives improves 
decision-making. 
 
Chapter 72: Why We Take Aim at Young Guns: Social Comparison Bias 
Summary: 
Social Comparison Bias is the tendency to make judgments based on comparisons with 
others rather than objective criteria. Dobelli explains how this bias can lead to envy, 
competitiveness, and poor decisions. 
Key Insights: 
• Social comparison bias leads to judgments based on comparisons with others. 
• This bias can result in envy, competitiveness, and poor decisions. 
• Focusing on personal goals and criteria improves authenticity and fulfillment in 
decision-making. 
 
Chapter 73: Why First Impressions Deceive: Primacy and Recency Effects 
Summary: 
Dobelli explores how first and last impressions significantly influence our judgments and 
decisions, a cognitive bias known as the Primacy and Recency Effects. He illustrates this 
with examples from hiring decisions to personal relationships. 
Key Insights: 
• First and last impressions heavily influence our judgments and decisions (primacy and 
recency effects). 
• This bias can affect hiring decisions, personal relationships, and more. 
• Being mindful of these effects and considering the entire context helps in making 
balanced and fair decisions. 
 
Chapter 74: Why You Can’t Beat Home-Made: Not-Invented-Here Syndrome 
Summary: 
Not-Invented-Here Syndrome is the tendency to reject ideas or products developed outside 
one's own organization or group. Dobelli explains how this bias can lead to missed 
opportunities and inefficiencies by dismissing valuable external innovations. 
Key Insights: 
• Not-Invented-Here Syndrome leads to rejecting ideas or products developed outside 
one's own group. 
• This bias can result in missed opportunities and inefficiencies. 
• Being open to external ideas and evaluating them based on their merits improves 
decision-making. 
 
Chapter 75: How to Profit from the Implausible: The Black Swan 
Summary: 
The Black Swan theory, popularized by Nassim Nicholas Taleb, refers to rare and 
unpredictable events that have significant impacts. Dobelli explains how these events can be 
overlooked due to their low probability, leading to unpreparedness and vulnerability. 
Key Insights: 
• Black Swan events are rare, unpredictable, and have significant impacts. 
• These events can be overlooked, leading to unpreparedness and vulnerability. 
• Acknowledging and preparing for Black Swan events improves resilience and risk 
management. 
 
Chapter 76: Knowledge Is Non-Transferable: Domain Dependence 
Summary: 
Domain Dependence is the tendency to apply knowledge or skills effectively in one domain 
but struggle to transfer them to another. Dobelli explains how this bias can limit our 
effectiveness when trying to apply expertise across different areas. 
Key Insights: 
• Domain dependence limits the transfer of knowledge and skills across different areas. 
• This bias can reduce effectiveness when applying expertise in new contexts. 
• Recognizing domain dependence and developing transferable skills improves 
adaptability and effectiveness. 
 
Chapter 77: The Myth of Like-Mindedness: False-Consensus Effect 
Summary: 
The False-Consensus Effect is the tendency to overestimate the extent to which others share 
our beliefs and behaviors. Dobelli explains how this bias can lead to misunderstandings and 
poor decisions by assuming consensus where none exists. 
Key Insights: 
• The false-consensus effect leads to overestimating the extent to which others share 
our beliefs and behaviors. 
• This bias can result in misunderstandings and poor decisions. 
• Seeking diverse perspectives and recognizing differing views improves decision-
making. 
 
Chapter 78: You Were Right All Along: Falsification of History 
Summary: 
Falsification of History refers to the tendency to rewrite past events to fit our current 
understanding and beliefs. Dobelli explains how this bias can distort our perception of history 
and lead to overconfidence in our predictive abilities. 
Key Insights: 
• Falsification of history involves rewriting past events to fit current beliefs. 
• This bias can distort our perception of history and lead to overconfidence. 
• Striving for accurate and objective recollections of past events improves honesty and 
decision-making. 
 
Chapter 79: Why You Identify with Your Football Team: In-Group Out-
Group Bias 
Summary: 
In-Group Out-Group Bias is the tendency to favor members of our own group while 
discriminating against those in other groups. Dobelli explains how this bias can lead to 
irrational loyalty and conflict. 
Key Insights: 
• In-group out-group bias leads to favoring members of our own group and 
discriminating against others. 
• This bias can result in irrational loyalty and conflict. 
• Recognizing the impact of this bias and striving for objective evaluations fosters 
inclusivity and rationality. 
 
Chapter 80: The Difference Between Risk and Uncertainty: Ambiguity 
Aversion 
Summary: 
Ambiguity Aversion is the preference for known risks over unknown risks. Dobelli explains 
how this bias can lead to avoiding opportunities with uncertain outcomes, even when they 
have potentially higher rewards. 
Key Insights: 
• Ambiguity aversion leads to preferring known risks over unknown risks. 
• This bias can result in avoiding high-reward opportunities with uncertain outcomes. 
• Understanding the difference between risk and uncertainty and embracing ambiguity 
when appropriate improves decision-making. 
 
Chapter 81: Why You Go with the Status Quo: Default Effect 
Summary: 
The Default Effect is the tendency to accept the default option rather than making an active 
choice. Dobelli explains how this bias can lead to suboptimal decisions by sticking with the 
status quo. 
Key Insights: 
• The default effect leads to accepting the default option rather than making an active 
choice. 
• This bias can result in suboptimal decisions by sticking with the status quo. 
• Being aware of the default effect and making conscious decisions improves choice 
quality. 
 
Chapter 82: Why ‘Last Chances’ Make Us Panic: Fear of Regret 
Summary: 
Fear of Regret is the anticipation of future regret, which can influence our decisions. Dobelli 
explains how this bias can lead to indecision and missed opportunities. 
Key Insights: 
• Fear of regret involves anticipating future regret, influencing decisions. 
• This bias can lead to indecision and missed opportunities. 
• Recognizing the impact of fear of regret and focusing on current information and 
values improves decision-making. 
 
Chapter 83: How Eye-Catching Details Render Us Blind: Salience Effect 
Summary: 
The Salience Effect is the tendency to focus on striking or prominent features of information 
while neglecting less noticeable but important details. Dobelli explains how this bias can lead 
to distorted perceptions and poor decisions. 
Key Insights: 
• The salience effect leads to focusing on striking features and neglecting important 
details. 
• This bias can result in distorted perceptions and poor decisions. 
• Being aware of the salience effect and considering all relevant information improves 
decision-making. 
 
Chapter 84: Why Money Is Not Naked: House-Money Effect 
Summary: 
The House-Money Effect is the tendency to treat money differently depending on its source. 
Dobelli explains how this bias can lead to irrational financial behavior, such as taking greater 
risks with "found" money or gambling winnings. 
Key Insights: 
• The house-money effect leads to treating money differently based on its source. 
• This bias can result in irrational financial behavior and risk-taking. 
• Treating all money with equal caution and making decisions based on overall wealth 
and goals improves financial decision-making. 
 
Chapter 85: Why New Year’s Resolutions Don’t Work: Procrastination 
Summary: 
Dobelli discusses Procrastination, the tendency to delay tasks despite knowing they should 
be done. He explains how this bias can lead to missed opportunities and increased stress. 
Key Insights: 
• Procrastination leads to delaying tasks and can result in missed opportunities and 
increased stress. 
• This bias can cause rushed, lower-quality work and last-minute panic. 
• Recognizing and addressing procrastination through strategies like breaking tasks into 
smaller steps and setting deadlines improves productivity and goal achievement. 
 
Chapter 86: Build Your Own Castle: Envy 
Summary: 
Envy is the tendency to feel discontented or resentful towards others' success or possessions. 
Dobelli explains how this bias can lead to negative emotions and poor decisions. 
Key Insights: 
• Envy leads to discontent and resentment towards others' success or possessions. 
• This bias can result in negative emotions and poor decisions. 
• Focusing on personal goals and achievements and striving for personal growth 
improves well-being and decision-making. 
 
Chapter 87: Why You Prefer Novels to Statistics: Personification 
Summary: 
Personification is the tendency to attribute human characteristics to non-human entities or 
abstract concepts. Dobelli explains how this bias can lead to irrational decisions by focusing 
on emotional narratives rather than factual data. 
Key Insights: 
• Personification involves attributing human characteristics to non-human entities or 
abstract concepts. 
• This bias can lead to irrational decisions by focusing on emotional narratives over 
factual data. 
• Balancing emotional narratives with statistical evidence improves decision-making. 
 
Chapter 88: You Have No Idea What You Are Overlooking: Illusion of 
Attention 
Summary: 
The Illusion of Attention is the belief that we perceive and remember everything in our 
environment, even though our attention is limited. Dobelli explains how this bias can lead to 
overconfidence in our observational abilities and missed important details. 
Key Insights: 
• The illusion of attention leads to overconfidence in our observational abilities and 
missed important details. 
• This bias can result in overlooking critical information and hazards. 
• Acknowledging the limits of our attention and enhancing focus improves awareness 
and decision-making. 
 
Chapter 89: Hot Air: Strategic Misrepresentation 
Summary: 
Strategic Misrepresentation involves deliberately presenting misleading information to 
achieve a desired outcome. Dobelli explains how this bias can lead to unethical behavior and 
long-term negative consequences. 
Key Insights: 
• Strategic misrepresentation involves deliberately presenting misleading information. 
• This bias can lead to unethical behavior and long-term negative consequences. 
• Promoting honesty and transparency and being critical of information sources 
improves ethical decision-making. 
 
Chapter 90: Where’s the Off Switch?: Overthinking 
Summary: 
Overthinking is the tendency to obsessively analyze situations, leading to indecision and 
anxiety. Dobelli explains how this bias can prevent effective action and reduce overall well-
being. 
Key Insights: 
• Overthinking involves obsessively analyzing situations, leading to indecision and 
anxiety. 
• This bias can prevent effective action and reduce well-being. 
• Recognizing overthinking and simplifying decision-making improves confidence and 
decision-making. 
 
Chapter 91: Why You Take on Too Much: Planning Fallacy 
Summary: 
The Planning Fallacy is the tendency to underestimate the time, costs, and risks of future 
tasks while overestimating their benefits. Dobelli explains how this bias can lead to overly 
optimistic plans and unmet deadlines. 
Key Insights: 
• The planning fallacy involves underestimating time, costs, and risks of future tasks. 
• This bias can lead to overly optimistic plans and unmet deadlines. 
• Incorporating buffer time and being realistic about task scope improves planning 
accuracy. 
 
Chapter 92: Those Wielding Hammers See Only Nails: Deformation 
Professionnelle 
Summary: 
Deformation Professionnelle is the tendency to view problems and situations through the 
lens of one's own profession or expertise. Dobelli explains how this bias can lead to narrow 
thinking and missed opportunities. 
Key Insights: 
• Deformation professionnelle involves viewing problems through the lens of one's 
profession or expertise. 
• This bias can lead to narrow thinking and missed opportunities. 
• Being open to diverse perspectives and considering multiple approaches improves 
problem-solving. 
 
Chapter 93: Mission Accomplished: Zeigarnik Effect 
Summary: 
The Zeigarnik Effect is the tendency to remember uncompleted or interrupted tasks better 
than completed ones. Dobelli explains how this bias can lead to lingering thoughts about 
unfinished tasks, creating mental clutter and stress. 
Key Insights: 
• The Zeigarnik effect involves remembering uncompleted or interrupted tasks better 
than completed ones. 
• This bias can lead to mental clutter and stress from lingering thoughts about 
unfinished tasks. 
• Breaking tasks into smaller steps and focusing on completion improves productivity 
and reduces stress. 
 
Chapter 94: The Boat Matters More Than the Rowing: Illusion of Skill 
Summary: 
The Illusion of Skill is the belief that success is primarily due to personal skill rather than 
external factors. Dobelli explains how this bias can lead to overconfidence and misattribution 
of success. 
Key Insights: 
• The illusion of skill involves attributing success primarily to personal skill rather than 
external factors. 
• This bias can lead to overconfidence and misattribution of success. 
• Recognizing external influences and maintaining humility improves assessments of 
success and failure. 
 
Chapter 95: Why Checklists Deceive You: Feature-Positive Effect 
Summary: 
The Feature-Positive Effect is the tendency to focus on the presence of features while 
ignoring their absence. Dobelli explains how this bias can lead to incomplete evaluations and 
poor decisions. 
Key Insights: 
• The feature-positive effect involves focusing on the presence of features and ignoring 
their absence. 
• This bias can result in incomplete evaluations and poor decisions. 
• Considering both the presence and absence of features improves decision-making. 
 
Chapter 96: Drawing the Bull’s-Eye Around the Arrow: Cherry-Picking 
Summary: 
Cherry-Picking is the tendency to selectively present data or information that supports a 
particular viewpoint while ignoring contradictory evidence. Dobelli explains how this bias 
can lead to misleading conclusions and reinforce existing beliefs. 
Key Insights: 
• Cherry-picking involves selectively presenting data that supports a viewpoint while 
ignoring contradictory evidence. 
• This bias can lead to misleading conclusions and reinforce existing beliefs. 
• Seeking comprehensive and balanced information improves accuracy and objectivity 
in decision-making. 
 
Chapter 97: The Stone-Age Hunt for Scapegoats: Fallacy of the Single Cause 
Summary: 
The Fallacy of the Single Cause is the tendency to attribute complex events to a single 
cause, oversimplifying the situation. Dobelli explains how this bias can lead to incomplete 
understanding and misguided solutions. 
Key Insights: 
• The fallacy of the single cause involves attributing complex events to a single cause. 
• This bias leads to incomplete understanding and misguided solutions. 
• Considering multiple factors and recognizing the complexity of events improves 
analysis and problem-solving. 
 
Chapter 98: Speed Demons Make Safe Drivers: Intention-To-Treat Error 
Summary: 
The Intention-To-Treat Error involves evaluating the effectiveness of an intervention based 
on those who fully comply with it, ignoring those who do not. Dobelli explains how this bias 
can lead to overestimating the success of programs or treatments. 
Key Insights: 
• The intention-to-treat error involves evaluating interventions based only on full 
compliance. 
• This bias can lead to overestimating the success of programs or treatments. 
• Including all participants in evaluations improves the accuracy of effectiveness 
assessments. 
 
Chapter 99: Why You Shouldn’t Read the News: News Illusion 
Summary: 
The News Illusion refers to the misleading nature of news consumption, where 
sensationalism and immediacy overshadow meaningful information. Dobelli explains how 
consuming news can distort our perception of reality and priorities, leading to unnecessary 
stress and poor decisions. 
Key Insights: 
• The news illusion involves the misleading nature of news consumption. 
• Sensationalism and immediacy can distort our perception of reality and priorities. 
• Limiting news consumption and focusing on reliable sources improves information 
quality and reduces stress. 
 
Conclusion 
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