Sales psychology is the knowledge of how people decide to buy: what they rely on when information is scarce, and what makes them put a decision off. Most sales tactics rest on a few well-researched effects: reciprocity, consistency, social proof, liking, authority, scarcity, price anchoring and loss aversion. They work while they help the customer choose, and stop working the moment the customer feels pushed.
Most lists of "psychological sales tricks" do not say where a tactic comes from or where it turns into deception. Below: 13 tactics grouped by stage of the sale, each with an example for chat or the website, a line not to cross and the original study. At the end, a three-question test to check that you have not crossed that line.
When people look up sales psychology
Usually the store has traffic and enquiries, but customers ask for the price in a messenger and disappear, carts are abandoned, and every sales rep answers differently. The owner searches for "sales psychology", "psychological sales tactics" and "how to persuade a customer to buy".
"How to persuade a customer" is the wrong question. These effects do not make anyone buy what they don't need; they remove doubt for someone who does need the product. The right question is what stops the customer from deciding right now.
Why the tactics work
People rarely weigh every option: with a lot of information and little time, they lean on simple rules such as "others do it", "more expensive means better" or "the first number I heard is the benchmark". Amos Tversky and Daniel Kahneman described these heuristics in 1974 and showed that they lead to predictable errors. Sales tactics use the same rules, either honestly, to make the choice easier, or dishonestly, to replace it.
| Stage | Tactics |
|---|---|
| Trust | 1 Liking and similarity · 2 The "because" reason · 3 Expertise |
| Choice | 4 Fewer options · 5 Price anchor · 6 Decoy option · 7 Loss framing |
| Decision | 8 Social proof · 9 Honest scarcity · 10 A small first step · 11 Reciprocity |
| After purchase | 12 Endowment effect · 13 Peak and end |
First contact: tactics that build trust
1. Liking and similarity
We agree more readily with people we like and who are like us. In Chartrand and Bargh's experiment, people whose posture was subtly mirrored by their partner rated the conversation as smoother. In chat, this means matching the customer's style: a short "how much?" gets a short answer with the price, a detailed question gets a detailed answer. The line: match the style; do not fake friendship or claim "I use it myself" if that is not true.
2. The "because" reason
Requests with a reason get granted more often, even when the reason is simple: Ellen Langer and colleagues showed this with a queue for a photocopier. Not "send a photo of the receipt", but "send a photo of the receipt, because the bank won't refund without it". The line: the reason has to be real.
3. Expertise
We trust people who know more than we do; Robert Cialdini calls this the principle of authority. For a store, that is not "we are market leaders" but a specific answer: a size chart with measurements, advice on compatibility, an honest "this model won't fit, you need another one". The line: no invented certificates, "doctor-recommended" claims or awards.
Choosing a product: tactics that make the decision easier
4. Fewer options
In the well-known study by Sheena Iyengar and Mark Lepper, a stand with 6 kinds of jam sold more than one with 24. But a later meta-analysis by Scheibehenne and colleagues found that the average "choice overload" effect is close to zero and appears only under certain conditions. The conclusion for a store is more modest: when a customer is lost, offer 2–3 options for their task instead of a link to the whole catalog. The line: do not hide the cheaper option that suits them.
5. Price anchor
The first number a person sees becomes the reference point for judging the next ones; this is the anchoring effect from the same Tversky and Kahneman paper. That is why an old price next to a new one, or a premium model next to the basic one, changes how the price feels. The line: the old price must be a price you actually charged. In the EU, a discount must be shown against the lowest price of the previous 30 days; in the US, the FTC treats a former price as genuine only if the product was openly offered at it on a regular basis for a reasonably substantial period.
6. Decoy option
Add an option that is clearly worse than one of the existing ones, and people choose that better one more often. Huber, Payne and Puto described this effect in 1982.
Illustrative example for the arithmetic; the prices are not market prices. A set with 1 jar costs €10, with 2 jars €24, with 3 jars €25. Next to the three-jar set, the two-jar set looks like a bad deal: one more euro buys a whole jar. So of the two larger sets, people pick the set of three.
The line: a decoy is honest if all three sets can really be bought and each one suits someone. First check that the set of three is profitable for you: how to build a discount into the price is shown in the article on how to calculate markup.
7. Loss framing
People feel a loss more strongly than an equal gain (Kahneman and Tversky's prospect theory, 1979), and the way a choice is framed changes what they pick (Tversky and Kahneman, 1981). "Without a screen protector, the screen scratches easily" works better than "with a protector, the screen stays intact". The line: the risk must be real and relevant to the product, with no scare tactics.
The moment of decision: tactics that remove doubt
8. Social proof
When unsure, we look at what others do. For a store, that means reviews with photos, the number of reviews and customer questions on the product page. The line: real reviews only, none bought and no negative ones hidden. Fake reviews are banned outright in the EU, and in the US the FTC's rule on consumer reviews, in force since October 21, 2024, prohibits fake reviews and review suppression.
9. Honest scarcity
What is rare seems more valuable. "Only 3 left", when there really are 3 in stock, helps people stop postponing. A "today only" timer that restarts every morning is a breach: the EU's Unfair Commercial Practices Directive lists, among practices that are always unfair, falsely stating that a product or its terms will be available only for a very limited time in order to rush the consumer into a decision.
10. A small first step
Someone who agreed to a small request agrees to a bigger one more readily: Freedman and Fraser described the foot-in-the-door technique in 1966, and Cialdini explains it by our wish to be consistent. In a store, a small step is a "notify me when in stock" signup, size advice in chat, an item added to a wishlist. The line: every step must be useful in itself, not a trap with a hidden subscription.
11. Reciprocity
We feel obliged to return a favour; this is the first of the principles Cialdini describes in "Influence". Useful advice with no sale attached, a sample in the parcel, an honest "you don't need this" all work for the next purchase. The line: a gift with no strings, not a "gift" you remind people about later.
After the purchase: tactics that bring the customer back
12. Endowment effect
We value what is already ours more than the same thing on a shelf: Kahneman, Knetsch and Thaler showed this in 1990. That is why trying at home, no-questions-asked returns and a trial period keep customers better than a discount: the person already feels the product is theirs. The line: the return terms must actually be simple, not only in the ads.
13. Peak and end
We remember an experience by its strongest moment and by how it ended: the peak-end rule from Kahneman and colleagues (1993). For a store, the end is unpacking and the first contact after delivery: neat packaging, a note, a quick answer to a question. The line: a good ending does not replace on-time delivery.
Many of these tactics work in answers to "it's too expensive" or "I'll think about it"; see the article on handling customer objections. How to uncover a need with questions instead of guessing is covered in the article on SPIN selling.
Test: persuasion or manipulation
Persuasion helps the customer choose what they need; manipulation replaces their choice. Before you put a tactic on the website or into a sales script, answer three questions:
- Is it true? The stock level, the old price, the reviews and the end date of the offer actually exist.
- Would the customer agree if they knew about the tactic? "We showed three sets so you have something to compare" is fine. "We reset the timer every day" is not.
- Do they still have time and a way out? They can postpone, compare and return the product without pressure.
One "no" is enough for the tactic to do harm: the customer may buy once but will not come back, and fake scarcity, fake discounts and fake reviews break consumer protection law in the EU and the US.
For the tactics to work, the sales rep has to remember the customer
Most tactics rely on knowing the customer: what they bought, what they asked, when they waited for an item. When conversations run across several messengers and the phone, without a single customer record a rep starts from zero every time. In Elbuz the customer record collects purchase history, messenger chats, emails and calls, and Elbuz works out the customer's stage (lead, regular, lapsed) from their purchases. How it fits together is shown on the ecommerce CRM page.
CRM for an online storeCustomer history, orders and chats in one record, 14 days free
Frequently asked questions
What is sales psychology?
The study of how people make buying decisions, and the skill of talking to a customer so the decision is easier. It rests on researched effects: reciprocity, social proof, scarcity, price anchoring and others.
Which psychological sales tactics work best?
The ones built on the truth: real reviews, real stock levels, a clear reason, useful advice. A tactic the customer perceives as pressure brings one purchase and loses the customer.
What is the difference between persuasion and manipulation?
Persuasion relies on true information and leaves the customer time and a way out; manipulation relies on falsehood or takes the choice away. Check any tactic with the three-question test above.
What is the best book on sales psychology?
Start with Robert Cialdini's "Influence: The Psychology of Persuasion" for the principles of persuasion. Daniel Kahneman's "Thinking, Fast and Slow" explains in detail why people make predictable errors in decisions.
How can an online store use sales psychology without sales staff?
Through the website: reviews with photos on the product page, a real old price only, a real stock level only, 2–3 options instead of a long list, and simple return terms.
Sources
- Cialdini R. B. Influence: The Psychology of Persuasion. New and expanded edition. Harper Business, 2021.
- Kahneman D. Thinking, Fast and Slow. Farrar, Straus and Giroux, 2011.
- Tversky A., Kahneman D. Judgment under Uncertainty: Heuristics and Biases // Science, 1974, 185(4157), 1124–1131 — doi.org.
- Kahneman D., Tversky A. Prospect Theory: An Analysis of Decision under Risk // Econometrica, 1979, 47(2), 263–291 — doi.org.
- Tversky A., Kahneman D. The Framing of Decisions and the Psychology of Choice // Science, 1981, 211(4481), 453–458 — doi.org.
- Huber J., Payne J. W., Puto C. Adding Asymmetrically Dominated Alternatives // Journal of Consumer Research, 1982, 9(1), 90–98 — doi.org.
- Freedman J. L., Fraser S. C. Compliance without pressure: The foot-in-the-door technique // Journal of Personality and Social Psychology, 1966, 4(2), 195–202 — doi.org.
- Langer E., Blank A., Chanowitz B. The mindlessness of ostensibly thoughtful action // Journal of Personality and Social Psychology, 1978, 36(6), 635–642 — doi.org.
- Chartrand T. L., Bargh J. A. The chameleon effect // Journal of Personality and Social Psychology, 1999, 76(6), 893–910 — doi.org.
- Iyengar S. S., Lepper M. R. When choice is demotivating // Journal of Personality and Social Psychology, 2000, 79(6), 995–1006 — doi.org.
- Scheibehenne B., Greifeneder R., Todd P. M. Can There Ever Be Too Many Options? A Meta-Analytic Review of Choice Overload // Journal of Consumer Research, 2010, 37(3), 409–425 — doi.org.
- Kahneman D., Knetsch J. L., Thaler R. H. Experimental Tests of the Endowment Effect and the Coase Theorem // Journal of Political Economy, 1990, 98(6), 1325–1348 — doi.org.
- Kahneman D., Fredrickson B. L., Schreiber C. A., Redelmeier D. A. When More Pain Is Preferred to Less: Adding a Better End // Psychological Science, 1993, 4(6), 401–405 — doi.org.
- Directive 2005/29/EC on unfair commercial practices, Annex I, point 7 (false "very limited time" claims), text checked on the official copy at legislation.gov.uk — legislation.gov.uk; the directive on EUR-Lex — eur-lex.europa.eu.
- European Commission, "New Deal for Consumers" factsheet: ban on submitting or commissioning fake reviews; the reference price for a reduction is the lowest price in at least the 30 days before it — commission.europa.eu.
- 16 CFR § 233.1, FTC Guides Against Deceptive Pricing: former price comparisons — law.cornell.edu.
- FTC, Trade Regulation Rule on the Use of Consumer Reviews and Testimonials, 89 FR 68034 (August 22, 2024), effective October 21, 2024 — govinfo.gov; FTC press release, August 14, 2024 — ftc.gov.
Checked on October 31, 2026. All prices in the article are illustrative examples.
John Smith
I've always been amazed how psychological tricks actually work in real life. Can you give examples?