One purchase makes the next one easier.
Researchers at Yale, Duke, and Stanford call this shopping momentum, and it is one reason a Black Friday trip for a TV often ends with a full cart.
Shopping momentum is one of several mental shortcuts that shape Black Friday buying. Others include deal perception, scarcity, deadlines, reference prices, and what other shoppers are doing.
Seven of these triggers have research behind them, and each one shows up in familiar Black Friday offers.
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It also covers how sellers can use them without crossing into tactics the Federal Trade Commission calls dark patterns.
What Is the Psychology Behind Black Friday?
The psychology behind Black Friday is a set of fast, intuitive reactions to deals. Shoppers respond to perceived bargains, limited stock, short deadlines, and crowds of other buyers. A first purchase also shifts them from weighing options to acting, which makes the next purchase easier. Together, these reactions lead many people to buy more than they planned.
The 7 Black Friday Triggers at a Glance
| Trigger | What happens in the shopper’s mind | Black Friday example |
|---|---|---|
| Deal perception | A discount feels like a win before the product is judged | 40% off banners |
| Shopping momentum | The first purchase makes the next one easier | Add-on offers after checkout |
| Scarcity | Limited stock makes a product seem more valuable | Doorbusters, limited quantities |
| Urgency | A deadline cuts time spent comparing | Sale ends at midnight |
| Anchoring | The first price seen sets the reference | Crossed-out regular price |
| Social proof | Other buyers signal a safe choice | Bestseller badges, reviews |
| Opportunity cost neglect | Shoppers forget what else the money could buy | Bundles framed as savings |
1. Deal Perception: Fast Thinking Takes Over
Black Friday is built for quick decisions. In a Yale School of Management analysis of Black Friday shopping behavior, Professor Nathan Novemsky explains the role of fast, intuitive thinking.
As he puts it, “System 1 reacts to perceived scarcity, perceptions of deals, and social proof.”
A large percentage on a banner signals value before the shopper checks whether they need the product. That is why the discount number often matters more than the item.
2. Shopping Momentum: One Purchase Leads to Another
Ravi Dhar, Joel Huber, and Uzma Khan studied this in The Shopping Momentum Effect, published in the Journal of Marketing Research in 2007.
They found that a first purchase can boost the purchase of a second, unrelated product.
The authors explain it through mindset. The first purchase moves a shopper from deliberating to acting, and the acting mindset carries into the next choice.
On Black Friday, this explains why post-checkout offers and add-on suggestions work. The shopper has already decided to buy.
3. Scarcity: Limited Stock Feels More Valuable
Products in short supply seem more desirable. Doorbusters use this on purpose: a deep discount on a small number of units for the first buyers.
Scarcity works best when it is real. A limited run of 200 units, with a visible counter, gives shoppers a fact to act on.
The urge to avoid missing out is closely linked, and brands use FOMO marketing all year, not only during sales.
4. Urgency: Deadlines Cut Comparison Time
A clear end time reduces how long shoppers spend comparing prices. Flash sales, hourly deals, and midnight deadlines all rely on this.
The Federal Trade Commission warns against fake urgency. Its report Bringing Dark Patterns to Light lists countdown timers that suggest a limited time when the offer is not time-limited.
5. Anchoring: The First Price Sets the Reference
Shoppers judge a price against the first number they see. A crossed-out $200 next to a $120 sale price makes the $120 feel like a bargain.
The anchor only works fairly if it is a real former price.
An invented regular price is one of the costliest Black Friday marketing mistakes, because FTC pricing guides treat it as a false bargain.
6. Social Proof: Other Buyers Signal a Safe Choice
When many people buy something, it feels like a safer choice. Bestseller badges, review counts, and recent purchase notices all signal this.
Social proof is strongest when it is specific, such as 1,200 reviews with an average of 4.6 stars, instead of a vague claim that customers love it.
7. Opportunity Cost Neglect: Shoppers Forget the Alternatives
Shoppers rarely ask what else the same money could buy.
A 2009 study in the Journal of Consumer Research, Opportunity Cost Neglect, found that consumers often fail to think of the alternatives a purchase would displace.
The same study found that cues reminding people of opportunity costs reduced purchase rates and shifted choices toward more affordable options.
For budget brands, this is useful on Black Friday. A message showing what the shopper saves for something else can work better than a general low-price claim.
Why Black Friday Feels Less Exciting Now
Many shoppers say Black Friday feels underwhelming. One reason is that it is no longer a single day of surprise deals.
Adobe’s 2026 holiday forecast expects discounts of up to 14% in early November, rising to up to 30% during Cyber Week.
The deals are spread across weeks, so no single moment feels special.
Scarcity and urgency also lose force when shoppers see the same offer for days. When every store has a countdown, none of them feels urgent.
October sales add to the effect. Shoppers can now weigh Black Friday versus Halloween discounts by category, so a November deadline feels less final.
How Sellers Can Use Black Friday Psychology Honestly
Each trigger works because shoppers trust what they see. These rules keep that trust intact.
- Real scarcity only: show a true stock count or a fixed number of units, never a fake low-stock warning.
- Real deadlines only: if the timer resets, it is not a deadline. End the offer when the timer ends.
- Real reference prices: compare against a price you actually charged, not an invented regular price.
- Real reviews: show verified reviews and counts, not selected quotes presented as typical.
- Clear total price: show shipping and fees before checkout, which the FTC report also flags as a dark pattern when hidden.
For offers built on these principles, the Black Friday promotion ideas list sorts 20 promotion types by margin cost.
How Shoppers Can Avoid Black Friday Impulse Buys
The same research points to simple defenses for shoppers.
- Write a list before the sale and set a total budget.
- Before each purchase, name one other thing the same money could buy.
- Check the item’s price history instead of trusting the crossed-out price.
- After the first purchase, pause before adding more items to the cart.
- Read the return policy before buying anything you are unsure about.
Frequently Asked Questions (FAQ)
Short answers on why Black Friday works and how it has changed.
Why do people buy more on Black Friday?
People buy more because Black Friday triggers fast, intuitive decisions. Deals, limited stock, deadlines, and crowds push shoppers to act before they compare.
Research on shopping momentum also shows that a first purchase makes the next one easier, so carts grow once buying starts.
What does Black Friday actually symbolize?
Black Friday symbolizes the start of the U.S. holiday shopping season, the day after Thanksgiving.
For shoppers, it stands for the year’s biggest discounts.
For retailers, it marks the start of the busiest selling weeks of the year, now stretched into a five-day event that ends on Cyber Monday.
Is the scarcity on Black Friday real?
Sometimes. Doorbusters with a fixed number of units create real scarcity, while some countdown timers and low-stock alerts do not.
The FTC lists countdown timers that suggest a limited time when the offer is not time-limited among its examples of dark patterns.
Why is Black Friday so underwhelming now?
Black Friday deals now start weeks earlier and run through Cyber Monday. In 2026, Adobe’s forecast has discounts climbing from the first week of November.
With offers spread across many days, the single-day rush that made Black Friday feel special has faded for many shoppers.
Is it ethical for brands to use psychology in Black Friday marketing?
Yes, when the claims are true. Real deadlines, real stock limits, honest reference prices, and verified reviews help shoppers decide.
It becomes a problem when the trigger is fake, such as a timer that resets or a regular price the store never charged.
The Triggers Work Best When They Are True
Black Friday psychology rests on fast decisions: deals, momentum, scarcity, deadlines, anchors, and other buyers. Each one helps a shopper act, and each one breaks trust when it is faked.
The name itself has a story behind it, and why it is called Black Friday is different from the red-to-black tale most people repeat.
Shopping for software yourself? Check renewal prices on the software deals running this Black Friday before a countdown pushes you to buy.