Persuasion Psychology: What It Is and How It Works

If you’ve made a purchase after reading a positive review, then you’ve experienced persuasion psychology at work. Brands consistently leverage fundamentals of human nature to drive specific consumer behaviors, such as making purchases or completing sign-ups. 

Behind these marketing persuasion techniques are the principles of persuasion psychology—the study of how people influence the attitudes and actions of others. The better you understand this area of science and its foundational concepts, the more effective you’ll be at influencing people to like and shop your brand.

Learn more about the six principles of persuasion and how you can apply them to your business to influence human behavior. 

What is persuasion psychology?

Persuasion psychology is the study of how communication techniques influence individuals to change their attitudes, beliefs, or behaviors. It examines the distinct roles that credibility, logic, and emotion play in persuasive communication, as well as the mechanisms underlying them. 

As an entrepreneur, understanding how persuasion fits into consumer psychology can help you more effectively motivate customer decisions. 

“It matters how people decide to spend their money, whether they decide to buy your product or buy another product, whether they decide to invest in your business or not,” says Maryam Haghigi, director of enterprise data science and insights at the Bank of Canada, on Shopify Masters. “So understanding how people make decisions, how human beings make decisions, has a direct impact on your [business].”

What does persuasion mean?

Persuasion describes a process where a person, brand, or other factors influence another person’s behavior or attitudes. It involves four elements:

1. Source. The credibility of the brand sharing the message.
2. Message. The words used to persuade.
3. Medium. The channel used to share a persuasive message.
4. Public. The audience being persuaded.

In business, persuasion is a fundamental part of effective marketing, because making a sale requires you to convince potential customers they need your products or services. You can use persuasive techniques like offering social proof and generating scarcity to enhance your marketing campaigns and lead generation efforts.

Bear in mind that persuasion doesn’t happen under duress; it’s more a form of influencing. “If you’re trying to get people to change behavior, fear is not a great motivator,” says Gloria Hwang, founder of bike helmet brand Thousand, on an episode of the Shopify Masters podcast. “But to get someone to want to do something is more interesting.”

Gloria, whose background is in psychology, underscores the importance of zeroing in on people’s motivations and desires to persuade them to choose your product. “I think one of the most important skills is to try to understand: What is it this other person values, and how do I deliver value?” she adds. 

For Thousand, this meant designing helmets stylish enough that people would actually look forward to wearing them.

6 principles of persuasion

1. Reciprocation
2. Commitment and consistency
3. Social proof
4. Liking
5. Authority
6. Scarcity

There are six key principles of persuasion, according to Robert Cialdini, Ph.D., a regents emeritus professor at Arizona State University and the social psychologist who published Influence: The Psychology of Persuasion (1984). 

As research for one of the field’s most preeminent texts, Cialdini spent time with sales operators, fundraisers, recruiters, and advertisers, observing how different elements of persuasion factored into their interactions with others. 

You can apply his six principles, often in tandem, to your marketing and other business dealings in numerous ways:

1. Reciprocation

Reciprocation describes a mutually beneficial exchange. In other words, if you perform a positive action for another person, they feel obligated to return the favor. This is why you receive those free address labels from fundraising nonprofits.

From a business perspective, this might look like giving potential customers something for free, such as a product sample. By offering them a gift or free trial, you build goodwill and increase the odds that they will want to complete a purchase, refer a friend, or engage with your brand in another positive way.

Creative content is another area where you can provide people with something free yet valuable. On Shopify Masters, Tori Dunlap, founder of money education platform Her First $100K, says her biggest business mantra is “serving before you sell.” 

Tori has made it a priority to distribute useful information at no cost through her brand’s blogs, social media posts, and free resources page. 

“It is so much easier to build a community, to gain people’s trust, to provide value to them, and then eventually to sell them on a product because they already trust you, they already find you credible, there’s already that community there,” she says.

2. Commitment and consistency

This principle asserts that people feel the need to remain consistent with their past behaviors, actions, and commitments. As an ecommerce brand, you can leverage this principle by first inviting your customers to make small commitments, such as signing up for your newsletter or commenting on one of your social media posts. 

After these small steps, they’re more inclined to complete your larger requests, like making a purchase, leaving a review, or referring your business to a friend. Cereal Company Magic Spoon asks customers to sign up to its newsletter with three simple questions: What is your birthday? Do you follow a particular diet? What is your email address?

Tip: These three questions are quick and easy, plus they provide opportunities for customer segmentation and personalized loyalty-building programs.

3. Social proof

People tend to study the actions and behaviors of those around them when trying to decide what they should do. In other words, the positive or negative opinion of another customer can go a long way toward helping someone make up their mind when they’re contemplating a purchase. This is known as social proof.

Social proof includes:

• Reviews
• Testimonials
• Endorsements
• Ratings
• Data points, e.g., “four out of five dentists recommend”
• Logos of corporate customers 

Display social proof like high star ratings or usage totals (“More than 1 million sold”) on your product, category, or home pages. For example, snack brand Elavi’s homepage features a message that reads “Over 1 Million Brownies Sold!”

User-generated content is a powerful source of social proof. Invite customers to write reviews and add photos of themselves using your products. Ask them to reshare social media posts of influencers and other consumers enjoying their purchases during everyday life.

“People look at what other people are saying to drive that purchasing decision. People want to see that buy-in,” says Michelle Razavi, one of the founders of snack brand Elavi, on Shopify Masters. 

In the company’s early days, she and her cofounder, Nikki Elliott, started posting screenshots of positive reviews to Instagram to get the word out about Elavi and persuade new customers to give the products a try. 

“As soon as you start to get testimonials, post them, share them, don’t hide them,” Michelle says, “because that’ll help other people get excited about buying your products.” 

In one Instagram Reel, Elavi shared a positive review from entrepreneur Bobbi Brown.

View this post on Instagram

A post shared by Elavi - protein brownies & dessert cashew butters (@heyelavi)

 

Tip: Authenticity is crucial when it comes to social proof. In 2024, the Federal Trade Commission (FTC) enacted a rule to combat fake and deceptive reviews. Practices prohibited include using bots, buying or selling fake reviews, and failing to disclose material connections between businesses and reviewers. 

4. Liking

People are more likely to agree to your requests if they already know and like you. Therefore, if you want people to do business with your company, it’s important to build brand trust among your audience and shape a likable image—particularly if your competition is fierce. 

Build rapport with your customers by consistently demonstrating that you care about the same things they do and that you value their input and feedback.

You can also seek out collaborators or endorsers whom your target audience already likes—for example, “it” brands or public figures. Influencer marketing, where brands work with influencers, is another popular method.

By securing a recommendation from a brand or person whose opinion your customers respect, you become that much more likable by association and increase the likelihood that shoppers will say yes to a purchase with you. 

One way clothing brand Lisa Says Gah capitalizes on this liking principle is to team up with well-known creators. For example, at the start of 2026, Lisa Says Gah released a capsule collection with Arden Rose, an actress, author, artist, and internet personality who has 700,000 followers on Instagram. The collection features Arden’s artwork. 

5. Authority

People are willing to trust brands that have expert backing. To help you build authority, add expert endorsements to your website or social media to promote your brand. Industry credentials and awards are another way to demonstrate expertise and trustworthiness.

For example, many beauty brands, like Rhode, display their Allure Best of Beauty badges on their product pages. The beauty magazine is a well-trusted source among the beauty community, with thousands of brands sending in their products for consideration. 

Allure spends the year testing items to find the ones that perform best across different categories. In 2025, Rhode’s Barrier Butter balm was a winner in the skin category. 

Another way to build authority is to create content that is genuinely useful and educational, such as on a blog or social media post. These efforts can go a long way toward building brand authority and cementing you as a leading figure in your field.

6. Scarcity

According to the scarcity principle, a person’s desire for an object or opportunity increases in correlation with how rare they perceive that something to be. Basically, the more exclusive or limited a thing is, the more they want it—especially if there’s a chance they might not get it at all. 

Read: How Perceived Value Can Lead to Increased Sales

You can tap into customers’ fear of missing out (FOMO) by manufacturing urgency around your products or services. For example, you might advertise that quantities are limited; a special offer with an expiration date; or an exclusive deal for your newsletter subscribers.

Bare Performance Nutrition leveraged both reciprocation and scarcity during a Fourth of July sale. Founder Nick Bare says that when his brand advertised that the first 3,000 customers would receive a free hat with their order, the first 3,000 orders came in four minutes. This underscores how powerful people’s desire for something limited can be, spurring them to action to avoid missing out.

Read: Limited Drops: A Guide to Using Scarcity to Drive Sales

3 theories of persuasion psychology

While Cialdini identified the six different factors that influence human behavior and people’s decisions, the theories of persuasion psychology are more concerned with why and how these influences are so effective on people in the first place. The three most prominent theories are: 

1. Social judgment theory

In the mid-1900s, social psychologists Muzafer Sherif, Carolyn Sherif, and Carl Hovland, and academic Roger Nebergall developed and advanced the theory of social judgment. Their goal was to explain what psychological tools people use to evaluate persuasive messages. 

They asserted that people subconsciously compare persuasive communications against their own existing beliefs, assigning them to one of three different latitudes on a continuum: rejection, noncommitment, or acceptance.

As an online business owner or marketer, your ability to successfully persuade customers depends on knowing how much they already agree or disagree with your viewpoint. If you want to win people as customers, meet people where they are in your marketing funnel. Try segmenting your customers by their attitudes in addition to their demographics, then tailor your messaging accordingly. 

2. Cognitive dissonance theory

Social psychologist Leonard Festinger published his theory of cognitive dissonance in the 1950s, aiming to describe the psychological discomfort people feel when their attitudes, behaviors, or actions are misaligned. 

To remove this internal conflict, Festinger determined people often try to change their way of thinking or rationalize their behavior to return to alignment. 

For consumers, cognitive dissonance can look like trying to defend their purchases, or struggling with buyer’s remorse. But your brand can get out in front of any post-checkout doubts by reinforcing your customers’ decisions. 

This is why marketing continues past the sale. It’s important to validate the buyer’s decision and create potential for a referral, positive review, and/or becoming a repeat customer.

For example, use positive language, such as “Great choice” or “You’re going to love your results,” on the order confirmation page, order confirmation email, or abandoned cart emails. Kids’ clothing brand Young Days sends abandoned cart emails with the subject line “We must say you’ve got good taste” to reassure customers and neutralize doubt. 

3. Elaboration likelihood model (ELM)

Developed by social psychologist Richard Petty and social neuroscientist John Cacioppo in the 1970s, the elaboration likelihood model describes how much cognitive energy a person is willing or able to put into analyzing a persuasive message. 

ELM asserts there’s a high-thinking, high-effort path (called the “central path”) and a low-thinking, low-effort path (called the “peripheral path”). 

Sometimes people are persuaded after a lot of careful consideration (central path); other times, people are persuaded quickly (peripheral path). 

Both central and peripheral routes can lead to conversions, as long as you’re strategic in your efforts. According to ELM, people take a central path when they’re highly invested in the outcome. 

More expensive brands might want to take this route because customers are likely to want to take their time to weigh credible evidence, available comparisons, and the fine details. This is common in B2B marketing, for example, where purchases require several approvals, investments are costly, and sales cycles are long.

To tailor your advertising to people on a central path, try releasing white papers, underscoring the science behind your offerings, publishing comparison charts, and writing detailed product descriptions.

Coffee concentrate brand Kloo includes graphics that give customers information about the flavor profile and where they sourced the item to help them make more informed decisions. 

Alt: A photo of a Kloo coffee concentrate product next to graphics that provide more detail about the item. 

People take the peripheral path when they’re distracted, ambivalent, or would rather rely on external cues, such as an attractive design, a celebrity endorsement, brand familiarity, or a high volume of positive reviews. 

Use both of these persuasive techniques in your marketing materials to test what does best with your audience. 

Small business examples of persuasion

Here are some examples of small businesses leveraging persuasion techniques to boost sales: 

KeySmart

The team behind KeySmart, a maker of key organizers and related accessories, understands that getting a “no” from a customer, or even the absence of a response (e.g., an abandoned cart), doesn’t automatically translate to failure. Instead, this initial rejection could be just one touchpoint on the road to persuasion.

According to Email Tool Tester, a warm inbound lead may require five to 12 touches before converting, while a cold prospect may require 20 to 50 touches, underscoring the importance of persistence. 

Taking this into consideration, KeySmart sends follow-ups via Facebook Messenger to shoppers who have added items to their shopping cart but then bounced before completing their purchase. 

One such note reads: “Hey there, we noticed you didn’t complete your purchase. We saved your cart for you. Click below to complete your purchase. Or let me know if you have any questions …”

This kind of persuasive message reminds the shopper of the actions they already took (“We saved your cart for you”), leveraging the psychological impulse to remain consistent with past behaviors. 

It also tries to reduce any mild cognitive dissonance by reducing friction and simplifying the checkout process (“Click below to complete your purchase”), and offering reassurance (“Or let me know if you have questions”).

Neil Hoyne, chief measurement strategist at Google, warns that if you message shoppers immediately after they’ve left your website, you might look desperate and actually end up alienating the consumers. 

Instead, the merchant data he’s seen at Google makes a strong case for waiting 48 to 72 hours. “Around three days after that interaction where they leave their shopping cart is the optimal time to increase purchase intent,” Neil says.

Busted Tees

To leverage the scarcity principle, Busted Tees highlights an approaching deadline when running a big promotion, such as “10 tees for $10 each.” Alongside this special offer at the top of its website, the T-shirt brand displays a countdown clock, alerting the shopper as to how much longer this promotion will be available. 

This tactic adds urgency to the negotiation process, signaling that the offer or goods are limited, and taps into consumers’ fear of missing out. 

Busted Tees demonstrates that you can be subtle—even a straightforward “Sale ends in …” countdown clock can be an effective nudge toward a purchase. You can try this in your own campaigns or on your product pages by downloading a countdown timer from the Shopify App Store. 

Display a countdown timer alongside a special rate or buy one, get one (BOGO) offer, or advertise “free next business day delivery if you order before 4 p.m. (ET),” for example.

Creating urgency around a decision is effective because human beings would rather avoid a loss than realize a gain. This is known as loss aversion, a cognitive bias. 

When you make it clear to customers they’ll miss out on a significant discount or lose out on free next-business-day delivery if they wait too long, you trigger loss aversion. This reminds them that a decision made today secures them a deal unavailable tomorrow.