Influence: The Psychology of Persuasion

About the Author

“Robert B. Cialdini, PhD, is an award-winning behavioral scientist and author. He is the president and CEO of Influence at Work, focusing on live and virtual keynotes, streaming, and online corporate training.

In acknowledgment of his outstanding research achievements and contributions to behavioral science, Dr. Cialdini was elected to the American Academy of Arts & Sciences and the National Academy of Sciences. He has over 230 professional and scientific publications. Robert Cialdini is Regents’ Professor Emeritus of Psychology and Marketing at Arizona State University.

Dr. Cialdini is known as the foundational expert in the science of influence and how to apply it ethically in business and elsewhere, and his Principles of Persuasion have become the cornerstone for any organization serious about increasing their effectiveness in sales, leadership, marketing, management and communication. He is a three-time New York Times bestselling author, with more than 5 million copies sold throughout the world. He is frequently referred to as the “Godfather of Influence.”

Sources: “About the Author” section of the book 

Our one-sentence summary

The psychology behind why people say “yes” can be explained through seven key principles of persuasion: reciprocity, liking, social proof, authority, scarcity, commitment, and unity. 

Publisher’s Summary

“In the new edition of this highly acclaimed bestseller, Robert Cialdini—New York Times bestselling author of Pre-Suasion and the seminal expert in the fields of influence and persuasion—explains the psychology of why people say yes and how to apply these insights ethically in business and everyday settings. Using memorable stories and relatable examples, Cialdini makes this crucially important subject surprisingly easy. With Cialdini as a guide, you don’t have to be a scientist to learn how to use this science.

You’ll learn Cialdini’s Universal Principles of Influence, including new research and new uses so you can become an even more skilled persuader—and just as importantly, you’ll learn how to defend yourself against unethical influence attempts. You may think you know these principles, but without understanding their intricacies, you may be ceding their power to someone else.

Understanding and applying the principles ethically is cost-free and deceptively easy. Backed by Dr. Cialdini’s 35 years of evidence-based, peer-reviewed scientific research—including a three-year field study on what leads people to change—Influence is a comprehensive guide to using these principles to move others in your direction.”

Source: Book Jacket 

Detailed Summary 

Preface

• Despite the conversational writing style, the contents of this book and its conclusions are based on properly conducted psychological research.
• New findings regarding the influence process have been made since the last edition of this book. This edition has been adapted to reflect such progress.
• There are three other main additions:
  • Internet-based applications of social-influence tactics, including social media,
  • Additional endnotes and citations,
  • A seventh universal principle of social influence– the principle of unity. 

Introduction

• As an experimental social psychologist, Cialdini has researched the psychology of compliance, particularly the psychological principles or levers of influence.
  • He has conducted laboratory experiments with college students and investigated through real-life experiences with professionals such as salespeople, fundraisers, marketers, recruiters, etc.
• Cialdini covers his and other experts’ findings via the seven principles, each presented in a chapter. The principles are discussed in terms of their function in society and how professionals rely on them to request purchases, donations, concessions, votes, etc.
• In this edition, the chapter order is based on how each principle achieves each of the three main motives of persuasion: relationship cultivation, reducing uncertainty, and motivation activation. 

Chapter 1 – Levers of Influence: (Power) Tools of the Trades

• In an experiment, volunteers were told that an energy drink would increase their mental abilities. One group was charged $1.89. The second was charged $0.89 and told they’d been given a price break. Then, they were asked to answer mental puzzles. Despite expectations, the first group did better.
• In a similar real-life case, Cialdini tells of a friend who struggled to sell turquoise Native American jewelry until an employee mistakenly priced them double the original price.
• Scientists who study animals in their natural settings have found that many species follow regular, blind mechanical patterns of action called fixed action patterns. These are trigger features that stimulate action.
• Humans have similar preset programs that usually work to our advantage. However, certain exploitative strategies can trigger the right programs at the wrong times.
  • If we ask someone to do us a favor, we’re more likely to be successful if we provide a reason. Scientists found that simply using the word because triggers automatic compliance.
  • In the case of the turquoise jewelry seller above, people assumed that expensive meant better. When unsure of an item’s quality, people often rely on price.
  • In the energy drink study, people expected the drink to work better when it cost more, and the mere expectation fulfilled itself.
• These mental shortcuts are termed heuristics (e.g., “If an expert said so, it must be true.”)
  • Whether we rely on heuristics greatly depends on our ability and desire to analyze information carefully. If an issue affects us personally, we’re more likely to scrutinize its information and arguments.
  • The form and pace of modern life keep people from making thoughtful decisions, even on personally relevant topics. Issues have become more complicated, distractors more intrusive, emotional arousal more intense, and mental fatigue deeper.
• Animal scientists have found a group of organisms called mimics that copy the trigger features of other animals to trick them into mistakenly performing the right behavior at the wrong time. Unfortunately, humans do this too.
• The principle of social proof suggests that people will believe and do what they see others around them believing or doing. This is how fake online reviews have influenced so many purchases.
• The contrast principle suggests that we see the difference between two things presented one after the other as greater than what it actually is. For example, if we lift a light and then a heavy object, we will estimate the latter as heavier than its actual weight.
  • Research has found that increased media exposure has exaggerated attractiveness and lowered desirability of actual potential mates.
  • In practice, salespeople often present expensive items first so that the prices of less costly items seem more reasonable by comparison.
  • In real estate, some companies showcase unappealing and overpriced houses first to make the actual listings seem more appealing by contrast.

Chapter 2 – Reciprocation: The Old Give and Take

• In an experiment, a professor sent Christmas cards to strangers. Unexpectedly, most of them, who had never met or heard of him, sent holiday cards back.
• The rule of reciprocation says that we will try to repay what another has provided or done for us, even outside the scope of gifts, party invitations, or holiday cards.
  • Charity requests preceded by a gift are more likely to yield greater contributions.
• This rule is pervasive in human culture, and all societies subscribe to it.
  • Some archaeologists and anthropologists argue that human society stems from reciprocity systems, webs of indebtedness, and the creation of interdependencies that bind individuals into efficient units.
• This reciprocity often manifests as a sense of obligation or debt. For example, people are less likely to leave a job if their boss treats them well and gives them birthday and holiday gifts, causing them to feel obligated to remain loyal.
• Humans will go to great lengths to avoid being labeled a freeloader. It is in this fashion that others can gain from our indebtedness.
• Reciprocation is overpowering. It can overwhelm the influence of other factors, such as likability, that normally induce compliance.
• Instead of disengaging the influence of the rule of reciprocation by saying, “No big deal” or “Don’t think about it” after being thanked, Cialdini recommends saying, “I know you’d do the same for me” or similar.
• Companies have learned to use small gifts to stimulate customer action. In restaurants, giving customers a mint with their bill increases tips.
  • In Colombia and Brazil, researchers gave balloons to children in McDonald’s before and after the families ordered. The total spent was 25% higher when the balloon was given before ordering.
• This rule is especially evident in political environments, where, despite denying accountability to gift givers, research shows that politicians—like everyone else, including the scientists studying this principle—are susceptible to its effects.
• During the Cold War, President John F. Kennedy agreed to remove US Jupiter missiles from Turkey and Italy in exchange for Russia withdrawing its nuclear missiles from Cuba (a deal revealed years later through declassified tapes).
  • People have been led to believe that what saved the world was an unwillingness to compromise when, in reality, it was the power of reciprocal exchange.
• In marketing, free samples are effective because they showcase the product and act as a gift, triggering the principle of reciprocity.
  • When gifts are customized or personalized to the recipient’s preferences, the reciprocity effect is magnified. Matching the gift to the need makes an even greater difference.
• In hotels, the highest ratings come not from perfect stays but from guests who encountered a service issue effectively resolved by staff. The remedy is often a special, personalized gift or assistance the hotel provides that triggers reciprocation.
• People can trigger feelings of indebtedness through uninvited favors.
  • The anthropologist Marcel Mauss described the pressures of gift-giving as an obligation to give, receive, and repay. The obligation to receive makes it easier to exploit this rule, as it prevents us from choosing those to whom we are indebted.
  • Companies and charity organizations take advantage of this by sending small gifts to encourage people’s donations. “There is a strong cultural pressure to reciprocate a gift, even an unwanted one, but there is no such pressure to purchase an unwanted commercial product” (p. 46).
• Most people are willing to do a bigger favor than they received to ease the psychological burden of debt. This is another reason why some people can exploit this rule.
  • Not returning a favor can cause the person to be disliked by a social group.
  • Research has found that if a woman allows a man to buy her drinks, she will be judged by both men and women as sexually available to him.
• The rule of reciprocation is unnecessary and undesirable in long-term relationships such as those between families or established friendships. Here, the expectation is that there will be a reciprocal willingness to provide what the other needs at some point in the future.
• An indirect way to use the reciprocation rule is to concede to someone who previously consented to us. You’re likely to comply if they move from a larger to a smaller request, even if you’re not interested in either option.
• The rejection-then-retreat technique, or door-in-the-face, involves making a large request and, after refusal, following up with a smaller request—the one you actually wanted. This method works only if the second request is seen as a genuine concession.
  • In an experiment, 83% of students declined chaperoning juvenile delinquents on a zoo trip. When another group was asked to commit to two years of weekly counseling and then asked about the zoo trip, the number of volunteers tripled.
  • This technique works to a point. Research shows that an unreasonable first demand can backfire as the second offer will not be considered a concession.
• This larger-then-smaller-request strategy stems from the reciprocation and perceptual contrast principle (Ch 1). It makes the smaller request look even smaller by comparison.
  • Research shows that this strategy increases agreement to the desired request and ensures follow-through, even for long-term commitments, as it elicits feelings of responsibility and satisfaction with the arrangement.
  • In a study in consumer research, feelings of responsibility for getting a better deal in a retail store led people to feel more satisfaction with the process and increased their likelihood of returning to the store.
• To protect against the influence of these principles, it’s important not to reject favors or gifts harshly but to evaluate each offer individually, recognizing that some favors and concessions may be genuine.

Chapter 3 – Liking: The Friendly Thief

• Research shows that likable celebrities endorsing certain beliefs can influence people’s own feelings and beliefs, as likability strongly impacts decision-making.
  • Many companies, like Tupperware and charities, recruit within neighborhoods to leverage the pressure people feel to say yes to someone they know and like.
  • Shaklee Corporation advises its salespeople to use a prospect’s friend’s name by calling and saying they suggested they would benefit from a conversation—this is known as the endless-chain technique.
• There are many factors that influence likability: Physical attractiveness, similarity, compliments, and association.
• The halo effect occurs when one positive trait, such as physical attractiveness, leads to a person being perceived positively in other areas as well (intelligence or competence).
  • Research suggests that we unconsciously attribute traits like talent, kindness, honesty, trustworthiness, and intelligence to good-looking individuals without realizing the influence of their attractiveness.
  • Experiments show that attractive people are more likely to receive help when in need and are more persuasive.
• Similarity is a powerful factor in likability: we tend to like people who are like us. This phenomenon was observed in nine-month-old babies.
• Studies show people are more likely to sign petitions from similarly dressed requesters or purchase products with brand names that share initials with their own. Salespeople often exploit this by claiming similar interests.
  • Cialdini warns readers to be wary of those who claim to be “just like you,” as we often underestimate how similarity impacts our preferences.
• Persuasion experts use body language and movement to enhance influence.
• Compliments and flattery play a key role in increasing likability.
  • On social media, likes trigger the brain’s reward centers in the same way as eating chocolate or winning money.
  • Flattery has been linked to larger tips and better hiring outcomes.
  • Research shows that flattery works even when it’s inaccurate or when people realize it’s for personal gain.
• Flattery can be delivered indirectly. A smart strategy is offering genuine compliments behind someone’s back.
  • For example, if your boss says something insightful in a meeting, telling their assistant how brilliant you thought the comment was will likely get back to the boss, making you appear sincere and boosting their opinion of you.
• People are likely to feel pride in the trait or behavior that produced praise, so it’s a good idea to praise them when they’ve done something you’d like them to repeat.
• Familiarity also influences likability. Our attitudes towards something can be influenced by the times we have been exposed to it.
  • Research shows that repeated exposure to an ad increases our liking of it, a phenomenon also observed in experiments where participants grew to like and were persuaded by a person’s opinion after repeatedly seeing pictures of their faces.
  • Note that continued exposure to a person or object under unpleasant conditions leads to less liking.
• Cooperation can enhance likability, which is why many professionals emphasize that they’re working with you toward a shared goal, fostering a sense of teamwork.
• Police interrogators often use the Good Cop/Bad Cop tactic to obtain confessions, leveraging the contrast principle, the reciprocity rule (as the good cop appears to intervene on the suspect’s behalf), and likability through cooperation.
• Conditioning and association also affect likability. For example, Cialdini describes a weatherman who was often blamed for bad weather, illustrating Shakespeare’s idea that “the nature of bad news infects the teller.”
  • Because of pure association, we naturally tend to dislike those who bring unpleasant information, even if they’re not the cause.
  • In an experiment, individuals who read bad news out loud were disliked by recipients and perceived as having malevolent motives and lower competence.
• Many products advertise by linking their products to cultural trends.
  • Research also found that people are more likely to spend money when credit card insignias are present in the room (e.g., people give greater tips if the bill tip tray contains a credit card logo).
• Due to conditioning and association, we learn early to avoid being linked with bad news. We often manipulate our visibility to connections with winners or losers to enhance our own image.
  • This is especially visible among sports fans, who use first-person plural pronouns (we) when their team wins and second-person plural pronouns (they) when their team loses.
• To guard against the influence of the likability principle, Cialdini suggests examining why we might favor a requester more than warranted. He recommends learning to mentally step back to evaluate an offer based solely on its merits, separate from the asker.

Chapter 4 – Social Proof: Truths Are Us

• In China, in partnership with researchers, chain restaurant managers found that adding a “most popular” label to certain menu items increased sales without changing prices or ingredients.
• The principle of social proof is a key lever of influence that explains why popularity is so effective: we determine what is correct by observing what others believe to be correct.
  • Social proof explains why advertisers inform us when a product is the fastest-growing or largest-selling; they’re showing that others think the product is good.
• This principle stems from society’s foundations: We tend to make fewer mistakes by following social evidence rather than opposing it. However, it has become a convenient shortcut for decision-making, leaving us vulnerable to exploitation by profiteers.
  • For example, nightclubs manufacture social proof by creating long waiting lines when there’s plenty of room inside.
• The power of social proof is so intense that it can influence morality, eating habits, and online purchases. For example, in a study, after being told that most peers favored the use of torture in interrogations, 80% of students judged it as morally acceptable.
• Social proof works better when there are more people involved. “The greater the number of people who find any idea correct, the more a given individual will perceive the idea to be correct” (p. 143).
• In ambiguous or unclear situations, we tend to follow others’ actions, as they reduce uncertainty about expected behavior. Uncertainty often stems from a lack of familiarity.
  • For example, in 1934, grocery store owner Sylvan Goldman noticed that customers stopped shopping when their baskets became too heavy. He invented the shopping cart but struggled to get people to use it, so he hired shoppers to push carts around the store. Eventually, real customers followed.
• In uncertain situations, most people seek social evidence to guide their behavior. However, the tendency for everyone to look for cues can lead to pluralistic ignorance.
  • This phenomenon explains why people are less likely to help victims when more bystanders are available to help.
  • Further research on bystander inaction found that aid is more likely when uncertainty is removed and witnesses are convinced of an emergency.
  • Given that the issue isn’t unkindness but uncertainty about whether an emergency exists and who should take action, Cialdini recommends reducing uncertainty by addressing an individual and clearly stating your needs, e.g., “You, Sir, in the blue jacket, I need your help! Please call 911 for an ambulance.”
  • Research shows that public confrontations between a woman and a man are often assumed to be a private matter between people in a relationship. So, people opt not to intervene. Cialdini suggests that women can yell, “I don’t know you!” to clarify the situation and prompt help.
• Social proof information doesn’t necessarily have to be visual (e.g., the contagious effect of applause.)
  • In politics, research indicates that debates impact election outcomes, with factors such as the audience’s reaction influencing remote observers’ opinions.
• Social proof relies on validity –assuming a behavior is correct if others do it – and feasibility –believing we can do something simply because others do.
  • For example, a study found that people are more likely to recycle if they see others recycling, in part because they now perceive it as less difficult to manage.
  • These two factors explain why people are three times more likely to conserve energy if told their neighbors are doing it than if told they can cut their power bills: the first reduces uncertainty and increases perceptions of achievability.
• Driven by survival instincts, humans often avoid social rejection and are thus more likely to be persuaded by perceptions of the majority and a desire for acceptance.
• Social proof is most powerful when we observe the behaviors of people similar to us, a phenomenon known as peer-suasion. For example, on a college campus, donations to charities more than doubled when the requester said, “I’m a student here, too.”
• Statistical analyses have found that when suicides get publicized, the number of airplane and automobile fatalities increases. While an explanation could relate to stressful societal events causing both types of deaths, research suggests differently.
  • The Werther effect (named after Johann Wolfgang von Goethe’s novel The Sorrows of Young Werther) suggests that when people learn about suicides, it can lead to imitative behavior among troubled individuals.
  • Sociologist David Phillips analyzed 20 years of U.S. suicide statistics and found that increased publicity around an initial suicide led to a higher number of subsequent suicides.
  • This pattern isn’t limited to news articles. When Netflix premiered 13 Reasons Why, suicides among adolescents rose by nearly 29% in the next 30 days.
  • The Werther effect explains the increase in accidents after suicide coverage. Phillips found that accidents occurring after suicides tend to be more deadly, often explained by behaviors such as pressing the accelerator instead of the brake or planes crashing with the nose down. That is, they’re likely suicides.
• Social proof also explains copycat crimes and similar scenarios. Cialdini argues that it played a significant role in the 1978 mass suicide of the People’s Temple based in San Francisco and later in Guyana.
• A common persuasion mistake occurs when public service communicators unintentionally make it worse when alerting the public to a problem. “Within the lament, ‘Look at all the people who are doing this undesirable thing,’ lurks the undercutting message ‘Look at all the people who are doing it’” (p. 185).
• Recent research suggests that future social proofinfluences decisions, which helps explain bull markets and real estate bubbles as people act based on expected trends.
  • In a study, one group of students was told that only a minority of their peers conserved water. The other was told the same but that the percentage had been increasing over the past two years. The first group increased their water usage, and the second decreased
• To reduce our susceptibility to the negative side of social proof, Cialdini recommends cultivating a sensitivity to counterfeit evidence of what others are doing and recognizing that the majority’s actions shouldn’t be the basis of our decision-making. 

Chapter 5 – Authority: Directed Deference

• Cialdini begins this chapter with a detailed description of the 1960s Milgram’s Shock Experiment. In this study, participants were instructed by an authority figure (a researcher) to administer electric shocks of increasing intensity to a “learner” (an actor) in another room whenever they answered questions incorrectly.
  • Despite the learner’s audible protests and signs of pain (all simulated), many participants continued to administer shocks under the researcher’s orders, even when they believed they were causing serious harm.
  • The experiment showed that people are often willing to follow authoritative commands, even at the expense of another’s well-being.
  • In variations where the researcher wasn’t an authority figure, participants stopped shocking the learner after the first few complaints.
• Like most of the other influence principles, authority is rooted in societal formation. It allows for complex organizational structures and prevents anarchy. Submission and loyalty to legitimate authority hold value.
• While obedience to authority can be necessary and rewarding, automatic compliance can lead to mindless obedience, making us vulnerable to exploitation.
  • For example, mindless obedience is common in hospital environments, where lower-ranking health practitioners rarely question a doctor’s authority.
• We are also influenced by symbols of authority such as titles and clothing. For example, some medication ads hire actors who play doctors on TV, relying on viewers’ mental associations to influence their choices, even though these actors aren’t real doctors.
  • In a study, the same man was introduced in five college classrooms, varying his status (student, lecturer, professor, etc.). Students then estimated his height. With each status increase, he was perceived as an average of half an inch taller.
  • In another study on blind obedience, researchers found that 95% of trained nurses were willing to administer an illegal drug in unhealthy doses to a patient if instructed to do so by a stranger who claimed to be a doctor over the phone.
• Research has found that uniforms and attire can make people comply with odd requests. For example, a study showed that people are 79% more likely to comply with requests when petitioners wear prestigious designer labels.
• People tend to resist being told what to do. That’s why business schools often advise managers to avoid a command-and-control approach. Effective influence hinges on being an authority rather than merely being in
• Expertise and credibility are crucial for increasing perceptions of authority, but gaining this perception takes time.
  • A key exception is when speakers disclose a weakness early on, as it increases perceived honesty, especially if the audience already knows about the weakness.
• Awareness of authority power and recognizing how easily authority symbols can be faked can help guard against undue influence. However, this doesn’t mean resisting authority altogether; some authority figures genuinely know better and deserve respect.
• A key strategy is to ask yourself, “Is this authority truly an expert?” and “How truthful can we expect this expert to be?”
  • The first question directs our attention away from symbols and focuses on the person’s credentials and their relevance to the topic at hand.
  • The second makes us consider the person’s trustworthiness. Wondering how they stand to benefit from our compliance shields us against automatic influence. 

Chapter 6 – Scarcity: The Rule of the Few

• Cialdini described a divorce lawyer’s struggles to finalize agreements during disputes. Typically, parties are placed in separate rooms and told, “All you have to do is agree to this proposal, and we’ll have a deal.”
  • Cialdini suggested rephrasing it as “We have a deal. All you have to do is agree to this proposal.” By framing the deal as a potential loss, the agreements were more easily reached.
• Research shows that, especially in conditions of risk and uncertainty, people make decisions to avoid loss more intensely than when pursuing an equivalent gain.
  • Daniel Kahneman’s loss aversion bias suggests that the prospect of losing an item drives us more than the prospect of gaining it.
• When an item is rare, customers won’t price it on perceived quality but on scarcity.
• The scarcity principle suggests that opportunities seem more valuable when they are less available. Professionals will rely on this principle using the limited-number
  • A key scarcity-based strategy, common on eBay and similar platforms, is to offer abundant items for sale one at a time.
  • Another strategy in retail stores involves a salesperson claiming they just sold the last item and then offering to check the back or another location to find it. This often leads to customers being more likely to buy the item once it is found.
• The principle applies to the quantity of items as well as to their traits or features. Scarcity can be created by highlighting specific attributes of an item.
• The deadline tactic consists of offering a deal with a time limit. For example, salesmen often pressure customers by saying that if they don’t buy now the price will go up later or the sale will expire.
• The scarcity principle stems from our understanding that things that are difficult to get are typically better. Another source is our desire to preserve our freedoms.
• Psychological reactance suggests that when our freedom is limited or threatened, we desire it significantly more than before.
  • For example, in a study, two-year-olds were more likely to prefer a toy that was out of their reach than an equally appealing yet accessible one.
• Research on censorship shows that when people learn about censorship, they desire to know more about it and are more likely to believe it is true.
• Psychological reactance also suggests that people are less likely to accept a message if they notice the persuasive intent (a removal of their freedom to decide on their own).
  • A good strategy to avoid reactance is providing negative and positive information to reduce the perception of being pushed in a given direction.
  • Reactance explains the New Coke phenomenon in 1985, when, despite tasting better, Americans worked hard to get Coca-Cola’s traditional formula back.
• Research has found that we value what has become more scarce recently more than what has always been scarce, especially if the scarcity results from social demand.
  • In a study, scarce cookies were rated more favorably than abundant ones, even though they were identical. Newly scarce cookies were rated even higher. And when the scarcity was due to social demand, participants rated the cookies as the most desirable.
• Due to the value of scarce resources, we strive to be seen as possessing unique qualities. This is particularly true in contexts like relationships and taste matters.
  • Because we desire to be accepted, we often change our opinions or beliefs to conform to others’. But when it comes to taste in clothing, hairstyles, food, music, etc., our motivation to stand out can supersede social acceptance.
  • To balance the desire to conform against the desire to demonstrate individuality, a study found that we often seek what the majority of our ingroup favors (a given brand), allowing for a visible differentiating feature (color).
• Scarcity pressures arise from emotional arousal, which hinder logical thinking. To guard against them, we can treat the emotional arousal as a signal to stop. Once calm and having regained rational perspective, we can reflect on why we want the item and assess the true merits of the opportunity.

Chapter 7 – Commitment and Consistency: Hobgoblins of the Mind

• Amazon’s “Pay to Quit” program offers $5,000 for employees to leave, with the goal of retaining only those who truly want to stay.
  • Cialdini suggests another reason: it strengthens commitment among those who stay, reinforcing their loyalty through their rejection of the offer.
• A study at horse tracks found that people become more confident about their choices after placing bets. In politics, voters feel more strongly about their choices after casting their ballots.
• The principle of consistency suggests that we have an innate drive to appear and be consistent. Once we make a choice or take a stand, we feel internal pressure to align our thoughts and actions with that commitment.
  • This pressure can be so strong that it leads us to do things we wouldn’t normally do, even acting against our own best interests.
  • In a study, researchers staged thefts on a beach. When a radio was left unattended, most people did not intervene after the theft. However, if they were asked to watch it and agreed, they were more likely to stop the thief.
• Consistency is innately associated with personal and intellectual strength. Inconsistency is often viewed as confusion, hypocrisy, or mental illness.
• Our desire for consistency can blind us, as it allows for convenient and effortless ways of dealing with life. However, it can function as a shield against thought.
  • Cialdini described attending a Transcendental Meditation recruitment session with a skeptical friend. Despite his friend’s loud, logical objections, many people signed up. Cialdini realized that these people were seeking solutions to real problems and feared that their logic might prevent them from ever taking action.
• For profiteers, our excessive need for consistency and the automatic responses that stem from it provide an opportunity for exploitation.
  • Toy companies often artificially limit the supply of popular toys during the holidays, forcing parents to buy alternatives and then return later to purchase the desired item—as they’d likely promised their child—boosting sales.
• The key to the consistency principle is commitment. Once a stand is taken, people tend to behave in ways that align with it.
  • For example, in a study, a researcher asked people how they would respond if asked to spend three hours collecting money for a charity. Not wanting to appear uncharitable, most said they would volunteer. This commitment procedure led to a 700% increase in actual volunteers.
• Another technique involves progressively escalating commitments. In sales, this strategy is called the foot-in-the-door technique, where a salesperson starts with a small request to eventually secure a larger purchase.
• Small commitments can influence people’s self-perception or self-image. “‘Every time you make a choice, you are turning the central part of you, the part that chooses, into something a little different from what it was before’ C.S. Lewis” (p. 313).
  • Commitments need to be active, public, effortful, and freely chosen to impact our self-image. People will use their own behavior as evidence of their beliefs and values to make decisions.
• People don’t like long registration forms. In online settings, experts have reduced the number of fields on the first page to increase completion rates, as this initial step creates a sense of commitment that encourages users to finish the registration process.
• Labels can increase commitment and appeal to consistency. For example, people are more likely to buy eco-friendly bananas if a label addresses them as environmentalists.
• Another powerful strategy requires written down and/or publicly made commitments. The social component increases our need to look like a consistent person. Therefore, the more public a stand, the less likely we’ll change it.
  • In an experiment, students estimated the number of lines shown to them. One group memorized their estimate, another wrote it down, and the third wrote it down and shared it. After receiving evidence indicating that their estimates were likely wrong, the first group was the most willing to change them, the second less so, and the third was the most resistant.
  • The good news is that publicly sharing our goals can help us break bad habits and form new ones. Many weight loss programs utilize this technique.
• The more effort invested in a commitment, the more it influences attitudes and actions. Many experts argue that hazing rituals in Greek letter societies enhance loyalty because of the commitment forged through enduring the process of gaining membership.
• Note that coercion isn’t commitment. We only accept responsibility for our actions when we believe we chose them without strong external pressures. Large rewards or threats may prompt immediate compliance but don’t foster long-term commitment.
  • This tendency has important implications for raising children, as it suggests we shouldn’t bribe or threaten them to do what we want them to truly believe in.
  • In an experiment, two groups of eight-year-old boys were told playing with a certain toy was forbidden. One group was threatened with punishment, while the other was not. Six weeks later, the boys were exposed to five toys, including the forbidden one. Those who were threatened chose the forbidden toy, and those who weren’t threatened chose to play with one of the other four.
  • “As Sam Butler wrote more than three hundred years ago, ‘He who agrees against his will is of the same opinion still’” (p. 340).
• Compliance or persuasion professionals value commitments that lead to broader change because the effects are lasting and not limited to the initial situation. These commitments often sustain themselves and expand over time.
• The low-ball tactic consists of offering an attractive initial deal and then increasing the price or adding conditions later.
  • Car dealerships often offer inflated trade-in values as part of a sales package. Once customers agree to the terms, dealers reduce the offer, claiming they overestimated the value. Customers then feel obligated to accept the deal due to their previous commitment and a pang of perceived guilt.
• Cialdini argues that most of the strategies in this book can be used for good or evil. The low-ball technique is no exception. In another study, this tactic successfully influenced homeowners to conserve energy.
• Another powerful strategy is reminding people of past commitments to restore it.
  • Overprescription of antibiotics is a growing issue in the U.S. Despite efforts like education programs and financial incentives, results have been minimal. Displaying a poster with the doctor’s photo and a signed pledge to avoid overprescribing reduced the rate by 27%.
• Reminders of commitments also strengthen them by augmenting the related self-image. In a study, those who had previously engaged in pro-environmental actions and were reminded of them were more likely to purchase environmentally friendly products.
• To recognize when consistency might lead to a poor choice, Cialdini distinguishes between two types of signals: stomach and heart-of-heart. Stomach signs arise when we’re pressured by commitment and consistency, indicating it’s better not to engage.
  • Heart-of-heart signals differ. To differentiate between signs, ask yourself, “Given what I know now, would I make the same commitment if I could go back?” The first flash of feelings you registered is a form of informative answer.
• According to Cialdini, age and individualism make individuals particularly vulnerable to the consistency principle. In contrast to Eastern societies, Western societies are more individualistic and tend to base future actions on past behavior.

Chapter 8 – Unity: The “We” Is the Shared Me

• Humans naturally tend to divide people into the categories of “we” and “them.” It is easier to influence and be influenced by those within our tribe.
• We judge those within our group more favorably, leading to in-group favoritism.
• Unlike similarity, in-group favoritism is not about liking a person. Rather, it’s about believing “that person is one of us.” It involves a shared identity.
• In some cases, group affiliation can result in identity merging, making it difficult for people to distinguish between their own traits and those of their fellow members.
• Tribalism and in-group favoritism can enable exploitation. Cialdini explains that many instances of fraud in the U.S. occur within ethnic groups, as individuals, tend to trust those who share their ethnic background.
• Cialdini introduces a new category of lies that fall between white lies and black lies: blue lies. These are intentional falsehoods told by members of an in-group to protect their group’s reputation, often at the expense of an out-group.
  • This is an ongoing phenomenon in political settings. Polarization and deceit for political gain flourish in climates of anger, resentment, and extreme division, all of which are fueled by strong party identification.
  • Within these groups, some individuals develop fused identities—people whose allegiance to the in-group (e.g., a political party) becomes so intense that they are willing to cheat or commit fraud in the name of the group.
  • In a study, participants taking tests could receive help from another participant whose political preferences were known. Despite poor performance, students consistently chose politically like-minded participants, even over more competent ones.
• Sports is also an area in which in-group favoritism becomes strong. Research continually finds that we-group bias corrodes judgment, even of those specifically selected and trained to avoid the bias (such as an umpire or referee).
  • For many, whomever they root for represents them. So, when the person they’re rooting for wins, they win too.
• In a study on conflict within romantic relationships, a strategy called partnership raising proved more effective in resolving disagreements and persuading partners than coercive or strictly logical
  • Couples who were able to discuss matters in terms of “we,” “our,” and “us” – that is, appealing to their partnership and unity –were more likely to resolve conflict and be influenced by each other.
• Close friendships influence people’s decisions and behavior. For example, researchers found that students’ alcohol intake and frequency conform to those of their close friends.
• Kinship is one of two main factors that lead to feelings of unity. Evolutionary biology suggests that we strive to ensure the survival of our genes.
  • Research has found that using collectives to create a sense of “we-ness” through labels like brothers, sisterhood, forefathers, motherland, and legacy produces bonding sensations similar to those of kinship.
• Physical proximity can heighten genetic-like unity. Humans have also evolved a tendency to favor and follow those outside of the home who live in proximity. This is called localism.
  • In the US, people are more likely to participate in a survey if it comes from a home state university.
  • World Championships can stimulate personal pride in our countries.
• The second of the two main factors that lead to unity is acting together. Since ancient times, humans have developed group bonding technologies: in unison or coordination, people performed rituals, dances, etc.
  • When people act in unity, they become unitized, which results in in-group solidarity, producing loyalty to the point of self-sacrifice.
  • Simple activities such as finger tapping in a laboratory have been found to result in more favorable attitudes towards other people.
• A married couple of researchers discovered an especially effective method of fostering unity called reciprocal self-disclosure. It involves partners answering a set of 36 questions that gradually increase in personal levels of disclosure.
• Another key factor that intensifies unity is suffering together. Studies show that those affected by the 2013 Boston Marathon bombings became more deeply connected with the Boston community, fusing their personal identities with the city.
• The IKEA effect suggests that humans feel a special affinity for things we helped create.
  • Affinity also grows when we collaborate to create something with others. For example, managers who believe they played a significant role in developing a final product are 50% more likely to view its advertising favorably compared to those with minimal involvement. They also tend to show greater loyalty to their employees.
• Companies that struggle to attain consumer brand loyalty invite current and prospective customers to “co-create” by asking for their advice. Providing advice stimulates a linkage of one’s identity with the other party’s.
• Cialdini argues that the strategies covered in this chapter can help us increase our sense of unity as a species. It requires a conscious choice to share with out-group members.
• Connections based on national identity, shared enemies, joint emotional experiences, and common perspectives can strengthen feelings of unity with out-group members, but these bonds are often ephemeral.
• Exploiters who perceive they are inside a tribe can seek to profit from primal tendencies to minimize, excuse, and even enable fellow members’ misdeeds.
  • Cialdini argues that while labor unions provide benefits and protect workers, they have become a shield for unethical behavior, with exploiters relying on the union to defend them, as many will do so not based on principles of right and wrong but out of loyalty to their members.
  • He argues this can be true for religious, political, and other well-intentioned groups that inadvertently protect wrongdoers due to the unity principle.
  • To prevent such behaviors, Cialdini suggests that groups must identify corrupt actors, clarify that leniency will not be granted, and implement a zero-tolerance policy, including dismissal for proven abuses.

Chapter 9 – Instant Influence: Primitive Consent for an Automatic Age

• When we make a decision, we often don’t consider all the relevant available information. We use an isolated, even if highly representative, piece of the total. At times, this shortcut is helpful, but other times, it can lead to mistakes.
• The pace of modern life demands that we rely on decision-making shortcuts for the sake of efficiency.
• Cialdini calls the reader’s attention to the fact that our modern era is not termed the Knowledge Age but rather the Information Age, arguing that information does not necessarily translate to knowledge.
• Technology is evolving at a rate faster than our adaptation speed, leaving our ability to process information insufficient to manage the overwhelming changes, choices, and challenges of modern life.
  • We are confronted with so many decisions that we often forgo a thorough analysis of each situation.
  • To avoid analysis paralysis, we increasingly rely on the most dependable aspect of a given scenario to guide our choices.
• One major challenge of the modern era is that persuasion practitioners have learned to exploit our mindless and mechanical ways of responding for the sake of profit.
• Cialdini argues that compliance professionals who ethically utilize shortcuts should be seen as allies, contributing to an efficient and adaptive exchange process. We should be wary of those who falsify cues that trigger our shortcut responses.
  • For example, when a brand truthfully advertises that it is the best-selling product in its category, it leverages social proof. In this case, the claim is evidence of the product’s quality and suggests that we will likely enjoy/appreciate it. We can view this advertiser as a cooperative partner rather than an antagonist.
  • Conversely, a fraudulent signal should provoke counteractions, such as boycotting the brand in question.
  • Cialdini argues that measures like shame, threat, confrontation, censorship, and tirades are necessary in cases of profiteering, as, in the modern era, we increasingly require reliable shortcuts to make accurate decisions.