Behavioral economics & viral marketing case studies
Labour Illusion 
Details
Labour Illusion means we value a service more when we see the effort behind it, even if that effort doesn’t actually change the result. Visible work feels like higher quality.
Think of a small family business that makes wedding dresses and shows videos of where they source their high-quality fabrics and how every stitch is done by hand. The dress isn’t technically different, but seeing the craft makes it feel more valuable and worth the premium.
In marketing this bias shapes how brands show process, craft, behind-the-scenes steps, or progress bars. When people see the work, they believe the service is better.
Labour Illusion 
Guide
Labour Illusion 
Research
In a Harvard experiment, a travel site that visibly showed its search process (scanning airlines, etc.) was preferred by 63% of users even when it took 30-60 seconds longer, versus only 42% preferring a faster site with no visible effort (that's a 50% difference!).
Customers valued the service more when they saw (or believed) more work was being done on their behalf.
Labour Illusion 
Examples
1. Stetson Cowboy Hats
Stetson openly shows its long, detailed hat-making process of felting, shaping, hand-trimming, and finishing that can take up to four weeks. Customers see photos and videos of artisans molding crowns, cutting brims, and polishing by hand. This visible craftsmanship creates a strong labour illusion, making the hats feel premium, authentic, and worth the high price.
Trollsky, run by Polish knifemaker Michał Sielicki, shows every step of the process: forging, grinding, heat-treating, polishing. Everything is visible through photos and videos. By exposing the dirty hands, sparks, steel, and slow manual work, he creates the feeling that each knife is built from scratch with real effort. This visible labour increases perceived value. Buyers see the knife as a crafted object, not a factory product, which justifies premium pricing and builds strong loyalty.
Guinness is poured in a slow, two-step ritual: pour, wait, top up. The extra time and visible effort make people believe more skill and care went into the beer.
Even though the process could be faster, the visible labour makes the beer feel higher quality and more “crafted".
Placebo Effect Details
Placebo Effect means our expectations change how we experience a product or outcome. When we believe something will work better, it often feels like it does, even if nothing objectively changed.
Think of taking an expensive painkiller you believe is strong and feeling relief faster, despite it being identical to a cheaper one. The belief shapes the experience.
In marketing this bias shows up in branding, packaging, pricing, and framing. When something looks premium, advanced, or “scientifically proven,” people often experience better results because they expect them.
Goal Gradient Effect Guide
Placebo EffectResearch
In a 2005 study, participants drank the same energy drink, but some were told it cost full price ($1.89) while others were told it was discounted ($0.89).
After 10 minutes, they solved anagram puzzles. The full-price group solved about twice as many puzzles, while the discounted group performed ~50% worse, despite consuming an identical product.
Follow-up analyses showed this happened because a lower price reduced expectations, and those weaker expectations directly reduced performance.
In a separate experiment, people who drank a discounted energy drink reported greater fatigue and worse workout quality than those who believed they paid full price.
The authors concluded that pricing acts as a placebo (or nocebo) - discounts can literally make products work worse by lowering perceived effectiveness, even when the product itself does not change.
Placebo Effect Examples
1. Red Bull
People who believe they drank Red Bull perform better on tests and feel more alert.
The effect comes from expectation, not just caffeine. Branding and messaging amplify the perceived boost.
Painkillers labeled specifically for headaches are perceived as working better for head pain than general pain pills. Even when the formula is the same, the specific promise changes how strong the relief feels. The brain expects better results in that exact spot and often experiences them.
Because people believe Guinness must be poured “the right way,” they expect it to taste better after the ritual. This expectation changes the experience. Drinkers report smoother texture and better taste. The ritual doesn’t just pour the beer, it primes the brain to enjoy it more.
IKEA Effect Details
IKEA Effect means we value things more when we’ve put effort into making them, even if the final result isn’t perfect. Effort creates attachment.
Think of assembling a simple shelf at home. It might look a bit crooked, but because you built it yourself, it feels more special and harder to throw away than a similar one bought pre-assembled.
In marketing this bias shows up in customization tools, build-your-own kits, quizzes, and products that let people co-create the final outcome. When customers invest effort, their perceived value goes up.
IKEA Effect Guide
IKEA EffectResearch
One research found that even if participants had built a simple IKEA storage box by themselves, they were willing to pay 63% more for it, compared to a group of people who only saw the fully built.
IKEA Effect Examples
1. Nike By You
Nike’s Nike By You lets customers design their sneakers: colors, materials, engraving. People value these shoes far more than regular ones, even if the quality is identical. The effort of customizing makes the final product feel premium and emotionally important - pure IKEA Effect.
Notion doesn’t give you a rigid structure, you build your own system: pages, databases, templates. People overvalue their messy, homemade setups because they made them. The more time someone spends constructing it, the harder switching apps becomes (huge retention effect).
Feedback Loop Details
Feedback Loop means one action creates a result, and that result shapes the next action. The cycle repeats and guides the system in a clear direction.
Think of a product getting great early reviews. Good reviews bring more customers. More customers create more good reviews. The loop grows and speeds up. That’s a positive feedback loop - momentum feeding more momentum.
Now think of a system that stops problems from growing. A drop in customer satisfaction triggers support alerts, support fixes the issues, satisfaction rises again. The loop pushes things back to normal. That’s a negative feedback loop - it pulls the system back into balance.
In marketing both loops matter. Positive loops drive growth, virality, and compounding results. Negative loops keep quality steady, protect trust, and stop small issues from turning into big ones.
Basically, positive loops speed things up, negative loops keep things under control.
Feedback Loop Guide
Feedback Loop Research
Before the experiment, households only received a monthly electricity bill - a big, delayed summary of what they did weeks earlier, offering no real-time guidance or motivation to change.
The researchers then installed real-time energy displays in these homes with small screens placed in visible areas that showed current electricity use and, in some versions, the exact money being spent or saved moment by moment. This let people see the immediate effect of their actions.
The results showed that households cut electricity use by about 15% on average, with reductions reaching up to 20% in the first weeks. Displays showing money saved produced even stronger effects than those showing only kilowatt-hours.
Feedback Loop Examples
1. Figma
Figma builds a product feedback loop by using community feedback, feature requests, beta testing and community discussions. They collect user input, then use that to shape updates, new features and improvements.
Whoop creates a closed feedback loop. While you train, the app gives you a strain score, for your sleep it gives you a Recovery Score, etc. Low recovery instantly nudges you to adjust your next-day behavior, and when your score improves, it reinforces trust in the device. Over time this loop becomes addictive, making people stay subscribed because they feel they can’t manage their training without those daily numbers.
Halo Effect Details
Halo Effect means we judge a person or a thing based on one strong trait. That single trait (good or bad) shapes our whole impression, especially during the first experience.
Think of meeting someone who’s kind right away. You instantly assume they’re also trustworthy and reliable. The same works in reverse, one rude moment can make everything else about them feel worse. The first trait sets the tone.
In marketing, a great first interaction, a beautiful design, or an excellent product lifts the entire brand. A bad first moment can drag everything down.
Halo Effect Guide
Halo Effect Research
In 1920, psychologist Edward Thorndike studied how officers rated their soldiers on things like leadership, appearance, intelligence, and loyalty. He found that if a soldier looked good in one area, officers automatically gave them high scores in the other areas too.
Later research found one big reason: attractiveness. Good-looking people are often seen as smarter, kinder, and better overall. Jurors are even less likely to think attractive people are guilty. But it can backfire. Other studies show people also think attractive people are more vain, less honest, and more likely to use their looks to get what they want.
Halo Effect Examples
1. Red Bull - extreme sports
Red Bull sponsored extreme sports, and that cool, high-adrenaline world created a halo around the drink. People felt the product itself was more energizing because of its associations. The drink became a lifestyle symbol, not just a beverage.
Patagonia consistently invests in pro-planet actions — repairs, recycling, “Don’t Buy This Jacket,” activism, and giving profits to environmental causes.
This moral reputation creates a halo: people believe all Patagonia products must be high-quality, fair, sustainable, and worth paying extra for.
Customers reward the brand with loyalty and higher willingness to pay, even without comparing specs.
Flow State Details
Flow State means you’re so focused on a task that everything else fades away. Time moves fast, distractions disappear, and the work feels smooth and almost automatic.
Think of playing a game, drawing, or coding and suddenly realizing an hour passed without you noticing. You were fully inside the activity, not thinking about anything else.
In marketing and product design flow keeps people engaged for long periods of time. Clear goals, quick feedback, and tasks that are challenging but not overwhelming pull users deeper into the experience.
The right balance of focus and challenge makes the world fall away.
Flow State Guide
Flow State Research
A study with 400 online shoppers found that clean layout, nice visuals, small animations, and social presence all boosted the flow score to 4.10/5. One element (virtual atmospherics - the mood created by visuals, colors, animations, sounds, and micro-interactions) had a significant effect on flow. When the flow went up, purchase intention also went up significantly.
A study with 310 mobile-shopping users found that when an app is easy to use and clearly helpful, people enter flow. That flow then increases how much they like the app and how willing they are to buy.
Usefulness by itself didn’t change attitudes. It only worked through flow, meaning the full path was: useful + easy >> flow >> better attitude >> stronger purchase intention.
Flow showed a strong, meaningful effect on both attitude and buying, though the study didn’t report simple percentage changes. The core insight is that mobile shopping apps should feel effortless and genuinely helpful, because this creates flow, and flow is what makes people want to buy.
Flow State Examples
1. Duolingo
Duolingo keeps people in flow because every lesson is short, clear, and gets a bit harder each time. You always know what to do next. Instant feedback (green check, exp, streak, sounds) keeps your brain locked in. No big decisions, no friction. Users often do 10–30 minutes without noticing.
Sounds weird, but Trader Joe’s stores are engineered for flow. Small aisles, simple layouts, limited choices = no overload. Everything is clearly labeled and consistent, so shopping becomes automatic. Samples, colors, smells, and handwritten signs add micro-feedback and micro-discoveries. People get into a rhythm and finish shopping faster without feeling rushed.
Aesthetic-Usability Effect Details
Aesthetic-Usability Effect means things that look good feel easier to use. A clean, beautiful design creates the sense that the whole experience will be smoother and more trustworthy.
Think of trying two apps that do the same thing. The polished one instantly feels simpler, even before you touch any feature. The look sets the expectation of quality.
In marketing and product design this effect makes visuals do double work. A nicer interface, better layout, or cleaner style makes people more patient, more forgiving, and more confident using your product.
Aesthetic-Usability Effect Guide
Aesthetic-Usability EffectResearch
Website credibility found that 94% of negative feedback about websites was design-related (layout, visual appeal, look & feel) and only 6% about actual content. Users also decide in about 50 milliseconds if a website feels trustworthy, based almost only on how it looks. Another survey showed that 75% of people judge a company’s credibility by its web design.
If your site looks modern and clean, people think you’re competent. If it looks old or messy, trust drops instantly.
Aesthetic-Usability Effect Examples
1. Apple
Apple nails this effect. Early iPhones missed features competitors had, but people still felt they were easier to use because the hardware looked premium and the UI was clean and pretty. Same with early iPods. The simple design and smooth click-wheel animation made users instantly like them. Apple’s design obsession (even the unboxing) pre-loads a feeling of “this will just work,” so small flaws get ignored.
By making an ugly product pretty, Nest also made it feel simple and smart, convincing thousands of non-techy homeowners to finally program their thermostat.
Occam's Razor Details
Occam’s Razor means the simplest explanation is usually the best one. When two explanations fit, the one with fewer moving parts is more likely to be true.
Think of fixing a device and assuming it’s broken, when the real issue is just a dead battery. The simple cause is almost always the right starting point.
In marketing, it means clear messaging, simple offers, and straightforward funnels work better than complicated setups that confuse people.
Occam's Razor Guide
Occam's Razor Research
Procter & Gamble cut their Head & Shoulders lineup from 26 shampoos to 15. Instead of losing customers, sales jumped 10% because people weren’t stuck staring at a wall of nearly identical bottles.
Steve Jobs, the creator of Apple, utilized Occam’s Razor as his brand philosophy. With a simple design using only a single button on the front and an easy-to-navigate home screen, the iPhone ruled the smartphone industry.
Occam's Razor Examples
1. Canva
Canva exploded because it removed every unnecessary step. Instead of a blank screen with 50 tools, it starts with a simple template grid. This is why millions of non-designers choose Canva over complex pro tools.
Before Calendly, scheduling was email ping-pong hell. Calendly marketed one clean idea, to schedule your availability with 1 link. That simplicity became the entire brand. The tool spread virally inside companies because it was obviously simpler.
Picture Superiority Effect Details
Picture Superiority Effect means we remember images much better than words. Our brains process visuals faster, deeper, and with far less effort than text.
Think of seeing a stunning mountain photo that takes your breath away versus reading a paragraph describing the same view. The picture hits instantly, while the text needs work.
In marketing this effect makes visuals do the heavy lifting. Photos, icons, and simple graphics stick in memory, boost understanding, and make ideas feel more real.
Picture Superiority Effect Guide
Picture Superiority Effect Research
The Picture Superiority Effect was demonstrated in a 2008 study that asked participants to memorize random pairs of words and random pairs of images.
The pairs were then reorganized, and participants were asked to spot what changed. The experiment showed that people were overwhelmingly better at identifying the differences in image pairs than in word pairs.
John Medina found that people remember only about 10% of plain text after 3 days.
But when the same info is shown with a relevant image, people remember around 65% of it 3 days later.
According to marketing-industry influencer Krista Neher, the human brain can process images up to 60,000 times faster than words.
Picture Superiority Effect Examples
1. Infographics and visual content
Infographics work because people read and remember visuals faster than text. Charts and icons turn messy data into something you can understand in one glance, which is why infographic posts get shared way more than essays.
Kickstart Side Hustle became a real business thanks to the sketch cards. Before them, people liked the idea but didn’t feel much. Once they saw the sketches, they loved it. The concepts suddenly felt tangible, and easier to understand and remember.
Sensory Appeal Details
Sensory Appeal means we pay more attention to things that wake up our senses. When something looks better, sounds clearer, feels smoother, or smells richer, it becomes more memorable and more tempting.
Think of walking past a bakery and catching the smell of fresh bread. You weren’t hungry a minute ago, but that scent pulls you in faster than any ad ever could.
In marketing sensory cues make products feel more real and more desirable.
Sensory Appeal Guide
Sensory AppealResearch
Researchers tested how scent changes buying behavior by putting identical Nike shoes in two rooms. One smelled like flowers, one had no scent.
People were 84% more likely to choose the scented-room shoes. This study helped spark today’s $200M scent-marketing industry.
The 2019 Mood Media study showed that turning on music, screens, and scent in an INTERSPORT store boosted sales by 10%. Shoppers also stayed longer 13.4 minutes vs. 7.9 minutes with everything turned off.
Adding scent in the “Football Zone” raised positive feelings by 28% and increased sales by 26%. Letting people touch products lifted emotional response by 50%, and 56% of shoppers said touch is the biggest reason they buy in-store.
Holding an item makes people up to 48% more likely to choose it or choose another product with the same shape/size.
People were 48% more likely to pick a chocolate when its shape matched the object they were already holding.
People were 39.9% more likely to choose a Fanta when they were holding a can or a bottle shaped like it.
The effect became up to 208% stronger when products were packed tightly together on crowded shelves, because touch helped people process them faster.
BIT (Behavioral Insights Team) wanted to influence meat-eaters to choose vegetarian food instead.
They only added a few words, such as:
Results? Sales of vegetarian options increased by up to 70%!
Sensory Appeal Examples
1. Starbucks
Starbucks is famous for its in-store aroma – they intentionally grind coffee throughout the day because the rich coffee smell entices people inside and makes the experience cozy.
Singapore Airlines even made its own cabin scent “Stefan Floridian Waters” so passengers instantly feel “this is Singapore Airlines.”