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The anchoring effect is a cognitive bias where the first number we see shapes the numbers we estimate after it. A $200 list price makes a $99 tag feel like a steal, even if $99 was the price all along. Stores design pricing pages around it because it works on almost everyone, including experts who know it exists. The anchor doesn’t even have to be related to the product.
The anchoring effect is one of the best-documented patterns in behavioral psychology. It’s the brain’s habit of grabbing onto the first number it sees and treating that number as a starting point. Every estimate after that point gets adjusted from the anchor, but the adjustment is usually too small.
In retail, this means the first price a shopper sees on a page shapes everything else they consider. The original $200 tag pulls their sense of what “fair” looks like. A $99 sale price, judged from $200, feels like a real bargain.
Psychologists Amos Tversky and Daniel Kahneman documented anchoring in a now-classic 1974 study. They spun a wheel rigged to land on either 10 or 65. Then they asked participants to estimate the percentage of African countries in the UN.
The wheel had nothing to do with the question. Everyone knew the number was random. Still, the answers moved sharply. Participants who saw 10 guessed about 25% on average, while those who saw 65 guessed 45%.
The wheel experiment used regular students. However, researchers wondered if professionals trained in evaluating numbers would be immune. The short answer: no.
In a 2006 study, German judges were asked to set a prison sentence for a hypothetical case. Before each ruling, they rolled dice that had been rigged to land on either 3 or 9. Judges who rolled higher numbers handed down longer sentences, even though they knew the dice were random. The effect held for experienced legal experts whose expertise didn’t reduce it.
Meanwhile, real estate research showed the same pattern. Asked to value identical houses with different listing prices, students and trained agents shifted their estimates with the anchor. The agents denied that the listing price had influenced them. The data showed it had.
Online stores deploy anchoring everywhere, often subtly. The most common form is the strikethrough price. A higher reference number with a line through it sits next to the actual sale price. That higher number is the anchor.
MSRP, “compare at,” and “RRP” tags work the same way. So do menus that show the most expensive plan first, since that price anchors how the cheaper plans feel. Even the order of options on a pricing page is a quiet anchoring move.
A 2003 lab study added a different twist. Researchers asked MIT students to write down the last two digits of their social security number, then bid on items. Buyers with high-ending SSNs paid an average of $55.64 for a wireless keyboard. Those with low-ending SSNs paid just $16.09 for the same item.
In WooCommerce, anchoring lives in the regular and sale price fields. Setting both side by side gives shoppers a visible anchor. Shopify and most other platforms work the same way. However, the strategic question is which anchor number to choose.
That choice is where the work is. A too-low anchor doesn’t lift perception. In practice, a too-high anchor breaks credibility. The sweet spot is roughly 20-50% above your actual price for everyday products.
For more on how to frame discounts and anchors in coupon strategy, see Advanced Coupons’ guide to pricing psychology tips.
Imagine a WooCommerce-based outdoor gear store called Summit Trail. The owner, Ben, sells a popular hiking backpack at $89. He’s been considering raising the price but worries about scaring off buyers.
Instead of just raising the price, Ben tries an anchoring test. He sets the regular price to $129 and the sale price to $89. The displayed price now shows “Was $129, Now $89” with the higher number crossed out. The actual checkout price stays at $89.
Nothing about the bag, the photos, or the product page changes. Only the displayed reference price. The bag costs the same to make and the same to ship. The only difference is what number sits next to the sale price.
After a month, Ben checks the data. Units sold per week climbed from 40 to 56, a 40% lift in volume. Revenue per week jumped from $3,560 to $4,984. The price the customer actually pays didn’t change at all.
As a result, the $129 anchor did the work. Buyers who would have walked at $89 now perceived $89 as a discounted price. The same dollar amount felt different because of what sat next to it.
Ben’s tempted to push the anchor higher. However, $129 still feels plausible for a serious hiking backpack. A $200 anchor on the same bag would risk feeling like a stretch, and savvier buyers would dismiss it. The right anchor is high enough to lift perception but believable enough to land.
Anchoring and the decoy effect are often confused. Both use extra information to nudge buyers, but they work differently.
Anchoring uses a single reference number to set the mental scale. It can be a list price, a “compare at” tag, or even a number someone heard before browsing. Buyers don’t have to compare options for anchoring to work.
By contrast, the decoy effect needs a comparison set. It adds a strategically bad third option that makes a target option look like the obvious winner. Without two real options to choose between, a decoy has nothing to do.
In short, anchors set the reference point for a single price. Decoys set the comparison frame for a choice between options.
Most pricing pages use both at once. A “Was $X, Now $Y” tag is an anchor. A three-tier subscription menu with one obvious dud is a decoy structure. For a related dynamic-price approach, see our entry on dynamic pricing.
Anchoring isn’t a free trick. It can lift conversions and average order value, but a bad anchor can backfire. Here’s an honest look at both sides.
Yes. The bias is automatic, not deliberate. Even researchers who study anchoring still respond to anchors in their own purchases. Awareness reduces the effect slightly but doesn’t switch it off.
A strong anchor is high enough to lift perception of the sale price but believable enough to land. The closer the anchor is to a price the buyer can imagine actually paying, the more it works.
Numbers that feel arbitrary or implausible tend to fail. The store loses credibility, and the anchor stops doing its job.
Almost. Anchoring is the underlying bias. Price anchoring is the retail application of that bias. They’re often used interchangeably in marketing writing.
The bias itself shows up in lots of non-pricing contexts too. Salary negotiation, real estate listing prices, and even sentencing in court all run on anchoring.
The anchoring effect is one of the most reliable cognitive biases in commerce. The first number a shopper sees shapes how they judge every number that follows, however arbitrary it is. Used well, an anchor lifts conversions and average order value without changing the real price. Used badly, it breaks trust faster than almost any other tactic.
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