Behavioral economics & viral marketing case studies
Veblen Goods 
Details
Veblen Goods are products people want more when they cost more. The high price doesn’t just signal quality, it creates desire by signaling status.
Think of a limited-edition luxury watch that becomes even more wanted after its price increases. The higher cost makes ownership rarer and more visible, so demand rises instead of falling.
In marketing, this effect appears in categories where status, visibility, and exclusivity matter more than utility. For these products, lowering the price would actually reduce their appeal.
Veblen Goods 
Guide
Veblen Goods 
Research
The research from 2018 shows when higher prices increase demand, and when they stop working. The author ran 8 controlled experiments using real luxury products (watches, trench coats, travel bags, champagne). Prices were raised by ~6% (low) and ~11% (high), which matches real luxury pricing (~3-10% per year, confirmed by experts). Results depend entirely on the motivation for why people buy.
Overall conclusion:
Price increases of ~6-11% raise demand only when price clearly signals status or exclusivity. Above this range, the effect often disappears and demand returns to normal (higher price >> lower demand). Price works only as a social signal, not as a cost, quality test, or pleasure tax.
Veblen Goods 
Examples
1. Hermès Birkin
Birkin bags officially start around $10,000-$12,000, but rare versions resell for $50,000-$500,000+, which only increases demand and status signaling. The difficulty and price make the bag a status symbol. People want it because most people can’t afford it.
Supreme sells basic items (T-shirts, bricks, crowbars) at very high prices. The price itself signals cultural status and insider knowledge. Cheap Supreme would not be Supreme.
Prestige Pricing Details
Prestige Pricing means setting a clearly higher price than the rest of the market to signal quality, status, and exclusivity. The price is not just a number, it’s part of the positioning.
This strategy works when the gap is obvious. Think of supermarket chocolate bars priced around $2.99-3.99, while a small artisan brand sells a bar for $15.00, shown as a clean, rounded price. The chocolate may look similar at first glance, but the high price instantly signals rarity, craftsmanship, and premium ingredients. You understand it’s a different category before tasting it.
Prestige Pricing is usually displayed with clean, rounded numbers, not 1.99 or 2.49. Rounded prices feel confident and deliberate. Rounding alone doesn’t create prestige, but it protects the premium signal once the price is clearly higher.
In marketing this approach is used by luxury and artisan brands that avoid discounts and price tricks. The price itself communicates status and quality.
Prestige Pricing Guide
Prestige PricingResearch
In a wine tasting study, researchers told people they were sampling two wines:
but it was actually the same wine.
Participants reported the “$45” wine tasted better, and their brain’s pleasure center showed more activity when drinking it. In essence, a higher price created an expectation of quality that literally enhanced the experienced quality.
Prestige Pricing Examples
1. Apple Watch Edition
Apple sold the Apple Watch Edition in solid gold for $15,000-$17,000, even though it worked almost the same as the regular Apple Watch. The high price was not about features, it was about status, exclusivity, and luxury signaling.
Rolex prices Source
Rolex watches are expensive and hard to get. The price tells others you are successful and serious, even before they know the model. Lowering the price would actually damage the brand.
Charm Pricing Details
Charm Pricing means prices ending in 9 or 99 feel cheaper than they really are. Our brain focuses on the first digit and ignores the rest.
Most pricing decisions are intuitive, not analytical. People feel the price before they calculate it. Charm pricing exploits that quick, emotional judgment.
Think of seeing a product priced at 9.99 instead of 10.00. Even though the difference is tiny, 9.99 feels noticeably cheaper because the leading number is lower.
In marketing this bias shapes how prices are set across products, sales, and promotions. Small changes at the end of a price can create a big shift in perception.
Charm Pricing Guide
Charm Pricing Research
In 2013, Gumroad analyzed all products on its platform priced under $6. They compared items with charm prices (ending in .99) to items with round prices (like $2 or $5).
Products with charm pricing converted at 3.5%, while round-priced products converted at 2.3%. This is a ~52% higher conversion rate for prices ending in .99!
The products were otherwise similar, so the main difference was the price ending. The result shows that even a small price change that does not affect real value can strongly change how people decide to buy.
In a real retail catalog experiment, the exact same dress was sold at three prices:
Even though $34 was cheaper, the dress priced at $39 sold the most. The $44 version sold less, as expected, but the key result is that $39 outsold the cheaper $34 option.
This shows that people do not always choose the lowest price. Prices ending in 9 can increase perceived value and attractiveness, likely because buyers focus on the left digit and interpret $39 as a better deal or higher-quality option than $34.
Charm Pricing Examples
1. Amazon
Amazon uses .99 pricing on millions of products. Shoppers scan fast and anchor on the first digit (19, not 20). The product feels meaningfully cheaper, even though the difference is 1 cent.
Starbucks often uses prices like $4.95 instead of $5.00. The left digit (4 instead of 5) triggers the left-digit effect, so the drink feels meaningfully cheaper. At the same time, .95 feels more premium than .99, which fits Starbucks’ “affordable luxury” positioning.
Bandwagon Effect Details
Bandwagon Effect means we’re more likely to choose something when we see many others choosing it. Popularity acts like proof.
Think of hearing that everyone is watching a new show. Even if you weren’t interested before, you feel a pull to check it out, partly to fit in, partly to not feel left out.
In marketing this bias powers social proof, bestseller tags, reviews, waitlists, and visible community numbers. When people see a crowd, they assume the choice is safe and worth joining.
Bandwagon Effect Guide
Bandwagon EffectResearch
The study examined the bandwagon effect in luxury buying. It focused on how much people want a luxury product when they believe popular or high-status people already use it.
The researcher ran 3 experiments with 60 teenagers, 76 female students, and 73 male students/graduates.
When people saw a message saying “popular people use this product,” several things changed:
The study clearly showed that the bandwagon effect works: when a product is linked to an admired group, people want it more, pay more, and choose options that signal status.
Cialdini’s famous hotel-towel study showed that people follow the bandwagon effect.
Guests saw 3 messages:
Message #2 increased towel reuse by 26%, and the message #3 increased it by 33%, making it the most effective. The study proved that people follow what others do, especially when the group feels close or similar to them.
Bandwagon Effect Examples
1. Clubhouse
When Clubhouse launched, people rushed in not because they needed audio chats, but because thousands of others were already inside. The invite-only system made it feel like a growing party you didn’t want to miss. The Bandwagon Effect created explosive growth to 10M weekly users before the hype faded.
Game of Thrones became a cultural event partly because huge numbers of people were already talking about it - memes, spoilers, theories, and reactions filled the internet every week. Even people who normally don’t watch fantasy felt pressure to join in, just to understand conversations at work or avoid feeling left out. The Bandwagon Effect turned the show from a niche book adaptation into one of the biggest global TV phenomena, reaching over 19M viewers for the finale.
TBH grew insanely fast because its viral loop was engineered to spread inside one school at a time, not across a whole city or country. When the app launched in a new school, hundreds of students got the same notifications, polls, and compliments at once, creating the feeling that “everyone here is using it.”
This hyper-local explosion triggered a powerful Bandwagon Effect. Once a few classmates joined, the whole school rushed in, because no one wanted to be the only person not included.
TBH hit millions of downloads in weeks, not because the app was global, but because each school became its own viral ecosystem driven by social pressure and FOMO.
Contrast Principle Details
Contrast Principle means we judge things by comparing them to what came just before. The first item sets the frame, and everything after feels bigger, smaller, cheaper, or better based on that anchor.
Think of trying on a jacket after checking a much more expensive one. The new jacket suddenly feels like a bargain, even if the price hasn’t changed. The contrast makes it look better.
In marketing this principle shapes perception fast. Showing a premium option first makes standard options feel more affordable. Placing products side by side changes how each one is valued.
Contrast Principle Guide
Contrast Principle Research
Bone (1990) showed that contrast happens only when two options are very different. If the products are similar, people don’t separate them. They “pull” the new product toward the reference and rate it more similarly (assimilation).
The study found the effect depends on how alike the items are, how well people remember the reference, and how many related features come to mind. For marketing: contrast works only when the difference is obvious and big; if things look too similar, the contrast effect disappears.
A study showed that when people judge a product right after seeing something very good or very bad, their opinion shifts in the opposite direction. The extreme example changes how they imagine the product or how they read the rating scale. In short, a product can feel better or worse just because of what came before it.
Contrast Principle Examples
1. HelloFresh
HelloFresh ads always show the contrast between messy grocery lists, crowded stores, random ingredients vs their neat box with pre-cut portions and a simple step-by-step recipe card.
Dollar Shave Club’s iconic ad hits you with a direct contrast of traditional razor brands that charge bloated prices for unnecessary bells and whistles, while DSC costs only a few bucks a month.
By placing the expensive, over-engineered razors next to their simple cheap ones
Decoy Effect Details
Decoy Effect means adding a third, less appealing option can push people toward the choice you want. The weaker option makes the target option look like the smartest deal.
Think of choosing between two subscription plans. When a third plan appears that’s overpriced and poorly balanced, it suddenly makes the mid-tier plan look perfect. The decoy steers the decision without saying a word.
In marketing this effect shapes pricing tables, bundles, and memberships. A well-placed decoy guides customers toward the option with the best margin or value.
Decoy Effect Guide
Decoy Effect Research
A study of an online diamond retailer found that after introducing a “decoy” option, the retailer’s gross profit rose by 21.4 % across different diamond price segments.
The study tested whether adding a decoy option makes people pick more expensive hotel and restaurant offers. Researchers ran a pilot test and a few studies with 463 adults in the USA.
1. study (fast-food menu)Options:
Results:
2. Study Hotels (cancellation policies)Options:
Results:
The famous decoy-pricing example used 3 real subscription prices from The Economist:
In Ariely’s experiment, when all 3 options were shown, 84% of people chose the combo and 16% chose web-only, while 0% picked the pointless print-only option, making it a perfect decoy.
But when the decoy (print-only) was removed, 68% picked the cheaper web-only and only 32% chose the combo.
This shows how one “useless” option can massively shift preference toward a higher-priced product, simply by changing the comparison frame.
Decoy Effect Examples
1. Jamba Juice
Jamba introduced a slightly smaller-than-large cup priced almost the same as the big one. The medium suddenly looked bad, so customers jumped to the large. The decoy wasn’t meant to sell, its job was to push people up a size.
Panera tested 3 sizes: small, medium, and a barely-bigger-than-medium large. The medium served as the decoy. It made the largest soup look like way better value for only a tiny price jump.
Centre-Stage Effect Details
Centre-Stage Effect means we naturally prefer the option placed in the middle. Our eyes go there first, and our brain treats it as the safest, most balanced choice.
Think of picking a snack from a shelf or choosing a seat. The middle spot feels more comfortable and more “right,” even when all options are the same. The position alone pulls you in.
In marketing this effect shapes how people choose plans, products, and bundles. Putting the preferred option in the center increases its chances of being picked because it feels like the default.
Centre-Stage Effect Guide
Centre-Stage Effect Research
In this study, people had to choose from options that were literally identical (identical products on store shelves). Even with no differences at all, the middle positions dominated:
Christenfeld also found similar patterns in everyday behaviour, like people using toilet paper from middle dispensers more often than from the ends.
Across several experiments, people strongly preferred the middle option when choosing between similar items.
Centre-Stage Effect Examples
1. Netflix
When Netflix shows recommended titles in a row, the platform often places its top push (the show they want you to watch) dead center.
On category pages, Sephora frequently positions high-margin or trending products in the middle column of the 3-column product grid.
Framing Effect Details
Framing Effect means the way information is presented changes how we feel about it, even when the facts stay the same. The frame shapes the reaction.
Think of hearing that a product is 90% effective versus hearing it has a 10% failure rate. Same numbers, but one feels safe while the other feels risky. The wording sets the mood.
In marketing, highlighting gains feels motivating, highlighting losses feels urgent, and shifting perspective can make the same offer look far more attractive.
Framing Effect Guide
Framing Effect Research
People were told a disease would kill 600 people. They had to choose between two programs.
The options were identical, only the wording changed.
1. Gain frame (positive)
Results:
2. Loss Frame (negative)
Results:
Same math. Different frame. Completely different behavior.
Framing Effect Examples
1. BetterHelp
Betterhelp therapy reframes therapy as normal self-care. The homepage frames depression as something normal. This reduces stigma and makes the purchase feel proactive, not reactive.
Liquid Death framed water as rebellious “Murder Your Thirst” beverage. They took a boring product (water) and reframed it as a punk, metal, anti-plastic energy-drink vibe.
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.
Hyperbolic Discounting Details
Hyperbolic Discounting is a fancy term for our tendency to be impatient and inconsistent over time. The closer something is in time, the more valuable it feels.
You know you should save money, but still you buy something small today because the benefit is immediate, while the long-term reward feels distant and weak. The present wins.
In marketing this bias pushes people toward instant bonuses, quick wins, and fast results. Offers that give something now beat promises of future value.
Hyperbolic Discounting Guide
Hyperbolic DiscountingResearch
In one classic study, people felt $15 today was about equal to $30 in 3 months, $60 in a year, or $100 in 3 years.
The implied annual discount rates were huge:
This shows hyperbolic (declining) discounting: extremely high rates for short waits, then much lower for longer waits.
Hyperbolic Discounting Examples
1. Klarna
Buy Now, Pay Late services like Klarna tap straight into present bias. When shoppers see they can get the item now and only pay next month (or in parts), they enjoy the reward immediately while the cost is pushed to their future self. No wonder Klarna exploded.
Duolingo is a perfect example of hyperbolic discounting in action. Learning a language takes months, so the real payoff is far in the future. To keep you hooked, Duolingo gives you small wins right away - streaks, XP, badges, chests, leaderboards, that happy owl cheering.