Persuasion without manipulation

Psychologist Robert Cialdini spent years studying how marketers and salespeople get people to say yes. Knowing his principles helps you make honest requests more persuasive, and helps you notice when someone is using the same levers on you.

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Seven principles in one list

• W. P. Carey News at Arizona State University lists Cialdini's seven principles: liking, reciprocity, social proof, consistency, authority, scarcity and unity.
• Cialdini groups them by what they do: unity, liking and reciprocity build relationships; authority and social proof reduce uncertainty; consistency and scarcity motivate action.
• Unity was added as the seventh principle in 2016. The original six came from Cialdini's study of the training programmes used by marketers and salespeople.
• None of these is good or bad in itself. What matters is whether you use them truthfully.

Reciprocity and liking

• Reciprocity: people feel a strong urge to repay kindness. In one example from ASU, a charity's basic letter got an 18 per cent response; adding a small gift of personalised address labels raised it to 35 per cent.
• Cialdini suggests asking 'Whom can I help here?' rather than 'Who can help me here?' Helping first builds goodwill honestly.
• Liking: a 1990 study of Tupperware parties, described by ASU, found guests rated their fondness for the host as twice as important as the product when deciding to buy.
• Cialdini says liking cannot be faked, because people usually sense a con. His advice is to find one trait you genuinely respect in the other person and say it out loud.
• Honest use: thank people, help them first and show real interest. Manipulative use: a 'free' gift designed to make you feel you owe a purchase.

Social proof, consistency and unity

• Social proof: people often decide what to do by watching what similar others do. ASU describes hotel signs saying most guests had reused their towels, which worked far better than environmental appeals (ASU gives no figures).
• The evidence is not as neat as it sounds: results across the towel studies seemed inconsistent, and a 2016 Bayesian synthesis by Scheibehenne, Jamil and Wagenmakers suggested that, taken together, the social-norm message did increase towel reuse.
• Consistency: people want to act in line with what they have already said or done. In a 1983 study described by ASU, about 92 per cent of residents who had signed a petition later donated, compared with just over 50 per cent of those who had not.
• Cialdini says the strongest commitments are active (spoken or written), public and voluntary. That is why sellers try to get a small 'yes' before a big request.
• Unity: people say yes more readily to those they share an identity with. ASU stresses using 'we' and 'us' only where the shared identity is real.

Scarcity, and where the ethical line is

• Scarcity: rare things feel more valuable, and people are more motivated by possible losses than gains. In a study described by ASU, telling homeowners what they would lose without insulation produced 150 per cent more installations than describing what they would save.
• Cialdini divides persuaders into three types. 'Bunglers' waste real opportunities. 'Smugglers' invent scarcity that does not exist. 'Sleuths' honestly point out what people might lose.
• He says everyone has the right to learn influence skills, but not to use them to exploit others, and that deceived customers stop doing business with smugglers.
• A simple test: would you be comfortable if the other person later discovered exactly what you did and why?

How sellers use these on you

• The US Federal Trade Commission's 2022 report on 'dark patterns' describes website designs that trick or manipulate users, including false claims of scarcity and countdown timers suggesting you have little time to buy.
• The same report describes fees revealed only late in checkout and subscriptions that are easy to start but hard to cancel. The Contracts, Purchases and Your Rights module covers subscriptions in more detail.
• Spot the lever: 'Only 2 left' (scarcity), '10,000 people bought this' (social proof), a free sample (reciprocity), 'You agreed it looked good, so...' (consistency).
• Defences: pause for 24 hours on any non-essential purchase; ask 'Would I want this if there were no timer?'; check prices and reviews on an independent site.

A checklist for persuading ethically

• Is everything I am saying true, including any deadline or limit?
• Am I describing real benefits and real losses, not invented ones?
• Am I using shared identity ('we') only where it genuinely exists?
• Would I still respect the other person if they said no?
• Script for a group project: 'We all want a good grade. Two other groups have already split the research by topic, and it saved them time. Shall we try it?' (honest social proof and unity).