Anchoring Bias
A cognitive bias where people rely too heavily on the first piece of information they encounter when making decisions.
What Is Anchoring Bias?
Anchoring bias is the well-documented human tendency to fixate on the first number, price, or piece of information we encounter — and then judge everything that follows relative to that anchor. Once an anchor is set, even random or irrelevant numbers systematically pull subsequent judgments toward them.
Also Known As
- Marketing teams: "price anchoring" or "reference pricing"
- Sales teams: "anchor close" or "high-anchor negotiation"
- Growth teams: "anchor pricing" or "MSRP effect"
- Product teams: "reference-dependent value"
- Behavioral science: anchoring-and-adjustment heuristic
How It Works
Imagine a SaaS pricing page. You show a crossed-out "$199/mo" above a "$99/mo" offer. The $199 becomes the anchor. The visitor doesn't evaluate $99 against the value of the product — they evaluate it against $199 and conclude it's a bargain. The same $99 offered in isolation would feel expensive. The anchor changed the reference point, not the product.
Best Practices
- Do present a single, confident anchor first rather than a range ("$197" beats "starts at $150–$250").
- Do make the anchor specific and plausible — hedged anchors ("from around $200") weaken the effect.
- Do use strike-through pricing only when the higher price is verifiable and real.
- Don't show multiple anchors simultaneously — competing anchors cancel each other out.
- Don't let social proof, testimonials, or features sit above the anchor; the first number wins.
Common Mistakes
- Putting the anchor below the fold, where most visitors never see it.
- Using obviously fake "original" prices that trigger skepticism and destroy trust.
- Testing "save 20%" vs "save $40" without controlling for which number the user sees first.
Industry Context
- SaaS/B2B: Annual plan totals ("$1,188/yr") anchor high so the "$99/mo" option feels manageable.
- Ecommerce/DTC: MSRP strike-throughs, bundle "total value" callouts, and premium-tier anchors on product cards.
- Lead gen/services: "Typical engagements start at $25k" anchors before revealing a scaled-down entry offer.
The Behavioral Science Connection
Anchoring was first documented by Amos Tversky and Daniel Kahneman in their 1974 paper on heuristics and biases. They showed that even spinning a roulette wheel before asking an unrelated numerical question shifted answers toward the wheel's number. Anchoring is a core building block of Prospect Theory and closely related to the framing effect, loss aversion, and reference-point dependence.
Key Takeaway
The first number a visitor sees defines the reference point for every evaluation that follows — control the anchor, and you control the comparison.