In Business, a Smile Is More Than an Expression: The Psychology of Attraction, Charm and Persuasion

How a simple human expression shapes first impressions, strengthens commercial relationships and changes the way people receive a message.

Key takeaways

• A smile does not close a sale. It changes the conditions in which a sale becomes possible.
• The evidence is mixed. Smiles linked to genuine goodwill help, while forced smiles can hurt.
• Culture changes how a smile is read, so African exporters and sellers should not assume that one style works in every market.
• Warmth and reliability work together. Neither replaces the other.

Introduction: the influence that begins before we speak

Picture two salespeople waiting to welcome you to a meeting.

The first gives you a serious look, a formal greeting, and starts explaining the products straight away. The second smiles naturally, makes you feel noticed, and the conversation starts without effort.

Both know their products equally well. Both represent competitive companies. Yet the two meetings feel very different.

The reason is simple. A business interaction is an exchange of information, but it is also a psychological and social experience. Before we judge a proposal, we form an impression of the person presenting it. We read the face, the voice, the posture, and the way we are received. I explored the same idea from the passenger side in how staff culture shapes the passenger’s emotional journey.

A smile is one of those signals.

Companies spend heavily on product quality, pricing, arguments and campaigns. They spend much less attention on a cheaper instrument: how people feel in our presence.

My view is that the smile deserves more attention in the psychology of marketing, sales, negotiation and customer experience. It guarantees nothing. It does not replace competence, remove objections or turn a weak product into a strong one. What it can change is the start of an interaction, and the start matters.

1. The psychology of attraction: why people respond to warmth

In commerce, attraction is less about appearance than about approachability. Does this person seem pleasant, familiar, worth talking to?

Research on facial expressions and social impressions has linked smiling with more favourable judgments of friendliness and trustworthiness. These judgments depend on context and do not prove anything about a person’s real character.

Robert Zajonc’s work on affect and cognition gives a useful starting point. His argument was that emotional reactions can arrive quickly and shape what follows. Daniel Kahneman, in Thinking, Fast and Slow, describes how fast, automatic impressions often come first, and how a favourable impression in one area tends to colour our judgment of others, a pattern known as the halo effect. This is part of why behaviour drives business success.

For a seller, the practical meaning is plain. A prospect rarely waits to finish evaluating your arguments before forming a view of you. They respond to the interaction while it is happening.

Take a customer with no history with you, little knowledge of your company and no reason yet to trust your offer. A natural smile signals openness. It lowers the sense of risk and makes it easier to join the conversation. That matters because engagement comes before persuasion.

Still, attraction is not trust, and trust is not purchase intention. A smile can start a relationship. The quality of what follows decides whether it grows.

2. Robert Cialdini and the principle of liking

In Influence: The Psychology of Persuasion, Robert Cialdini lists liking among the principles that make people more willing to say yes. We are more receptive to people we like, and similarity, sincere compliments and cooperation all feed that liking.

This is the foundation for taking the smile seriously. A smile can support a good first impression, but it is not a formula for producing agreement.

Compare two negotiations. In the first, the salesperson treats every question as an obstacle and every objection as resistance. In the second, the salesperson combines competence with warmth, listens, acknowledges concerns and handles disagreement constructively. The smile belongs to the second approach, but the strength comes from the behaviour, the knowledge and the real interest behind it.

Many businesses assume persuasion means better arguments. Often the first problem is getting those arguments a fair hearing. People may listen more willingly to someone they like, but they still want a reason to believe what that person says.

3. Pre-suasion: what happens before the pitch

In Pre-Suasion, Cialdini examines how the focus of a person’s attention just before a message can shape their response to it. The question shifts from what we say to what happens immediately before we say it.

Applied to sales, that means looking at the moments before the presentation. How is the customer welcomed? Does the meeting feel rushed or respectful? Is the seller attentive or distracted? Does the customer feel acknowledged, or merely counted as revenue?

A smile can be part of that opening. Think of a client arriving at a hotel, a bank or a company reception. The first human contact starts shaping the experience before the service itself begins. A welcoming face suggests openness. A dismissive one suggests indifference.

The same holds in B2B. When you meet a procurement manager, importer or distributor, the relationship starts before the commercial presentation. For exporters, that first contact is part of the buyer trust strategy Rwanda needs.

A precision is needed here. Cialdini’s research does not show that a smile is a pre-suasion technique with a guaranteed effect. His framework explains why the moments before a message deserve deliberate attention. Persuasion starts with the interaction, long before the argument.

4. Rory Sutherland and the doorman fallacy

Rory Sutherland, in Alchemy, argues that people respond to psychological value as much as to measurable, physical value, and that organisations focused only on efficiency often destroy value they cannot see on a spreadsheet.

His best-known illustration is the doorman. A consultant looks at a hotel, sees a person whose job appears to be opening a door, and proposes replacing him with an automatic door. On paper the cost falls. But the doorman was also providing welcome, a sense of security and a signal of status. Define a rich role by one visible task, replace that task with a cheaper mechanism, and the real value disappears with it.

The smile at reception, the greeting on a sales call and the first words on a WhatsApp reply belong to the doorman’s real job. They carry psychological value that no price list shows. A company that trims every human touchpoint to save time may save the cost of a few seconds and lose the feeling that made customers return. I made a related argument in how misguided cost cutting slows down Rwandan businesses.

5. What customer research says about smiling

The link between smiling and customer experience has been tested directly, and the results are more careful than the slogan “service with a smile” suggests.

• Barger and Grandey (Academy of Management Journal, 2006) coded real service encounters. Employee smiling was linked to customer satisfaction, but the effect ran mainly through the customer’s judgment of service quality, and customers’ own mood did not fully explain it.
• Hennig-Thurau and colleagues ran a simulated service encounter with 223 consumers. In their results, how much employees smiled did not change customers’ emotions by itself, while the authenticity of the employee’s emotional display did.
• Andrzejewski and Mooney (Journal of Retailing and Consumer Services, 2016) compared genuine (Duchenne) and non-genuine smiles. Their conclusion was that a smile alone may not be enough to deliver service excellence.
• Lechner and colleagues, in a study reported in Psychology & Marketing (2022), found that a genuine smile from a virtual adviser led to more purchases. A fake smile reduced buying mainly when customers had a large choice, and made little difference when the choice was limited.

Together these studies teach the same lesson. A smile helps when it matches what the customer is living. Picture a customer who has waited an hour to fix a billing error and finally meets an employee with a broad smile, no apology and no solution. The smile feels disconnected. Now picture an employee who acknowledges the delay, takes responsibility and fixes the problem. A natural smile at the right moment communicates goodwill, while the action supplies the substance.

So a smile can improve the experience of receiving service. It cannot compensate for service that was never delivered. Training staff to smile on command is a weaker investment than developing their ability to read a situation and respond to it. That starts inside the company, as I argued in why your first customer should be your employees.

6. The anthropology of the smile: a signal of no harm

Anthropology and primatology add something the marketing literature often skips. Researchers have proposed, following the work of Jan van Hooff in 1972, that the human smile descends from the silent bared-teeth display seen in many primates. In chimpanzees and other primates, that display communicates benign intent and appeasement, and it works to reduce the risk of aggression and increase affinity.

That origin helps explain why a smile still carries weight with strangers. It is an old signal that says: I mean no harm. In a first commercial meeting, where two parties have no history, that signal has real value.

Yuval Noah Harari’s Sapiens points to what happens next. Large-scale human cooperation, he argues, depends on shared beliefs and stories that let strangers trust each other. Commerce is a clear case. A buyer in one country orders tea from a seller in another because both trust the same invisible structures: contracts, reputations, and promises. I would add my own reading here. Before those structures can do their work, small human signals do the first job, and a smile is among the cheapest and oldest of them. It opens the door to trust. Behaviour afterwards decides whether trust stays.

7. Culture changes how a smile is read

A smile is not read the same way everywhere. Krys and colleagues (Journal of Nonverbal Behavior, 2016) pointed out that most psychological research on smiling comes from WEIRD societies: Western, educated, industrialised, rich and democratic. Their cross-cultural study found that a smiling person may be judged as less intelligent than the same person not smiling in cultures low in uncertainty avoidance. They also found that in societies with high corruption indicators, trust toward smiling individuals was lower.

Philip Kotler’s work on international marketing makes a related point at the level of strategy: the cultural environment shapes how buyers interpret marketing, so the marketer has to adapt. The same applies to people as much as to packaging. Anthropologist Edward Hall’s distinction between high-context and low-context communication offers a practical lens. In high-context settings, much of the message is carried by relationship, tone and setting. In low-context settings, the message is expected in explicit words and documents.

For an African agribusiness selling tea, coffee or other produce to buyers in Europe, the Gulf, Asia or North America, the implication is concrete.

• Do not assume that a warm, expressive greeting will be read the same way in every buyer’s market.
• Observe how local counterparts greet, how quickly they move to business and how much personal talk they expect.
• Ask a trusted local contact or experienced agent about etiquette before a first meeting.
• Where trust in institutions is low, a smile alone will buy little. Proof will do more: samples, certifications, traceability records and a track record of honoured deliveries.

On the home front, the same attention applies. Rwanda, Nigeria, Kenya, Senegal and South Africa each have their own norms of greeting and formality. Warmth that is natural in one setting may seem too familiar in another. The link between buyer psychology and export growth is something I develop in why Rwanda’s export growth depends on buyer psychology, and the Rwanda tea and Mombasa comparison shows how reputation travels.

8. Charm: the difference between influence and manipulation

Charm involves more than appearance. A charming person makes an interaction feel comfortable and personal. They show curiosity, pay attention and make others feel their presence matters. A smile contributes, but it is one element among several.

The line between charm and manipulation is drawn by what follows. A seller who smiles only to lower resistance, while hiding limits or applying pressure, may win a short-term advantage. When the customer discovers it, the relationship suffers.

A seller who uses warmth to make the conversation easier while staying honest about the product builds something that lasts. The test is in the behaviour. Does the seller listen? Do they respect a decision not to buy? Do they state the limits of the product? Do they keep supporting the customer after payment?

For me, the most valuable form of charm is the ability to make people comfortable enough to engage with us without feeling that their autonomy is under threat.

9. Seth Godin and Simon Sinek: people, trust and relationships

Seth Godin’s This Is Marketing asks marketers to understand the people they serve and build real connections rather than appeal to everyone. A smile fits this view because marketing is experienced through people: the receptionist, the salesperson, the support agent, the manager receiving a partner. A premium brand with indifferent staff creates a gap between the promise and the experience.

Simon Sinek, in Leaders Eat Last, writes about environments where people feel safe and supported enough to cooperate. A manager who greets staff warmly each morning but ignores their concerns shows how a smile cannot cover a contradiction. In sales, a supplier may smile throughout a negotiation, yet the buyer’s confidence depends on honoured agreements and honest communication.

Warmth and reliability are partners. When competing suppliers offer comparable price and quality, the quality of the relationship can become the deciding difference.

10. What business leaders and sales teams should do differently

1. Treat the first interaction as part of the customer experience. Reception, introductions and the first reply to an enquiry all count.
2. Pair warmth with competence. A smile invites engagement, but the seller must still know the product and answer questions credibly.
3. Read the situation. A natural smile suits a welcome. A serious, attentive face suits someone explaining a problem.
4. Measure the whole customer experience, not the smile. Track feedback, complaints, repeat purchases and relationship quality.
5. Build warmth into the culture. Employees cannot sustain it if they are treated with disrespect or denied the authority to solve problems. A company that wants staff to make customers feel valued must look at how it treats them.
6. Prepare for culture. Before meeting buyers in a new market, learn the local norms for greeting, formality and eye contact, and adapt without losing sincerity.

Conclusion: the first thing we sell may be the experience of engaging with us

We focus on what we sell, how we price it and how we persuade. These questions matter. Another one deserves a place beside them: what is it like for people to deal with us before they decide whether our offer is worth considering?

A smile can create a favourable first impression, soften an encounter and make a conversation more inviting. Under the right conditions it supports the social setting in which negotiation and relationship-building become easier. It also has limits. It cannot manufacture competence, guarantee trust or cover for poor service, and its meaning shifts from one culture to another.

By the time a customer reads our price list, they have already formed an idea of what it is like to work with us. That idea is part of what we are selling.

A smile buys attention, not agreement. Biology gave it its meaning, culture decides how it is read, behaviour decides whether it is believed, and trust is what remains when the smile has gone.

Dr Martin Mawo

Frequently asked questions

Does smiling help in sales? It can help create a favourable first impression and make a customer more willing to engage. Research shows the effect depends on authenticity, context and the service that follows. A smile does not replace competence.

Is a fake smile bad for business? It can be. Studies find that genuine smiles are viewed more favourably than non-genuine ones, and one experiment found that a fake smile lowered purchases when customers had many options to choose from.

Is a smile understood the same way in every culture? No. Cross-cultural research shows that smiling can be judged differently depending on factors such as uncertainty avoidance and the level of corruption in a society. Sellers entering a new market should learn local norms.

How does this apply to African exporters and agribusiness sellers? Warmth supports a first meeting, but buyers decide on quality, consistency, traceability and delivery. Treat the smile as the opening of the relationship and let documented reliability carry the rest.

About the author

Dr. Martin Mawo is a behavioural and marketing psychology researcher, consultant and author based in Kigali, Rwanda. He holds a doctorate in management with a specialization in behavioural science and works across African markets. He publishes his research and frameworks at martinmawo.com.

Sources and further reading

• Zajonc, R. B. (1980). Feeling and thinking: Preferences need no inferences. American Psychologist.
• Kahneman, D. (2011). Thinking, Fast and Slow.
• Cialdini, R. B. Influence: The Psychology of Persuasion; Pre-Suasion (2016).
• Sutherland, R. (2019). Alchemy: The Dark Art and Curious Science of Creating Magic in Brands, Business, and Life.
• Barger, P. B., and Grandey, A. A. (2006). Service with a smile and encounter satisfaction: Emotional contagion and appraisal mechanisms. Academy of Management Journal, 49(6), 1229-1238. doi.org/10.5465/AMJ.2006.23478695
• Hennig-Thurau, T., Groth, M., Paul, M., and Gremler, D. D. Are all smiles created equal? How emotional contagion and emotional labor affect service relationships. marketingcenter.de
• Andrzejewski, S. A., and Mooney, E. C. (2016). Service with a smile: Does the type of smile matter? Journal of Retailing and Consumer Services, 29, 135-141. ideas.repec.org
• Lechner, A. T. and colleagues (2022), Psychology & Marketing. University of Augsburg press release
• Krys, K., et al. (2016). Be careful where you smile: Culture shapes judgments of intelligence and honesty of smiling individuals. Journal of Nonverbal Behavior, 40(2), 101-116. doi.org/10.1007/s10919-015-0226-4
• Van Hooff, J. A. R. A. M. (1972), on the silent bared-teeth display and the origin of the smile; reviewed in Kim, Y., et al. (2022), Affective Science, 3(4), 749-760. doi.org/10.1007/s42761-022-00138-1
• Harari, Y. N. Sapiens: A Brief History of Humankind.
• Godin, S. This Is Marketing. Sinek, S. Leaders Eat Last.
• Kotler, P., and Keller, K. L. Marketing Management. Hall, E. T. Beyond Culture.