The Anchoring Effect: Why the First Number You See Can Influence Your Thinking 

You see a number. Any number. Price tag, a stat someone throws out in conversation, a random figure on a spinning wheel in a psychology lab. And that number just… sticks. It doesn’t even have to be relevant. It just needs to show up first.

That’s the anchoring effect. Or anchoring bias, if you want to call it that-researchers use both terms depending on which paper you’re reading, and honestly the distinction barely matters for our purposes here.

What is the anchoring effect?

The anchoring effect is a cognitive bias where the first piece of information a person receives becomes a reference point for everything that follows. Judgments after that point get pulled toward the anchor, even when the anchor has nothing to do with the actual question at hand. Behavioral economics has spent decades poking at this, and it keeps holding up, which is sort of unusual for psychology findings these days given the replication crisis and all that.

Daniel Kahneman and Amos Tversky are the names attached to most of the early anchoring psychology work, back in the 1970s. Their spinning wheel experiment gets cited constantly- participants spun a wheel rigged to land on either 10 or 65, then were asked to guess what percentage of United Nations countries were African. People who saw 65 guessed way higher than people who saw 10. The wheel had zero connection to the UN or Africa. It didn’t matter. The number anchored them anyway.

It’s a weird finding when you sit with it. Not because it’s hard to believe-most people, once they hear it, go “oh yeah, that tracks”; but because it reveals how little control we actually have over our own reasoning process sometimes.

Anchoring in prices, which is where most of us actually feel it

Price anchoring is probably the version of this bias that touches daily life the most. You walk into a store, see a jacket marked “was $300, now $120,” and something in your brain does the math wrong. Not wrong exactly, but skewed. The $300 becomes the anchor. Suddenly $120 feels like a steal, even if the jacket was never really worth $300 and even if similar jackets sell for $80 elsewhere.

Retailers know this. It’s not some secret conspiracy, it’s just… standard practice at this point. Menus do it too: expensive wine listed near the top of the list makes the mid-range bottles look reasonable by comparison. Real estate listings sometimes get priced slightly high on purpose just so the eventual “discount” looks generous.

I keep thinking about how this applies beyond shopping too, actually. Salary negotiations work almost identically.

Negotiation anchoring

Anchoring adjustment theory says that once an anchor is set, people adjust from it, but the adjustment is usually insufficient. Meaning: if a number gets thrown out first, whoever hears it moves their thinking toward it and stays closer to it than they should, logically speaking.

This is why negotiation coaches, salary consultants, basically anyone who’s ever written a LinkedIn post about “negotiation tips” tells you to make the first offer. Whoever throws out the first number frames the entire conversation. If you’re negotiating a salary and you say $95,000 first, the conversation orbits around that. The other side might counter at $85,000, you settle at $90,000. But if they said $75,000 first? Different orbit entirely. Same negotiation, same people, wildly different outcome, just because of who spoke first and what number came out of their mouth.

Some research suggests this doesn’t always hold: here are conditions where the anchor backfires, like when it’s obviously extreme or insulting, and then people anchor away from it out of spite. Reactive devaluation or something like that gets mixed in. It’s not a clean rule. Nothing about human decision making ever is.

Why does this even happen?

There are a few explanations floating around in cognitive bias literature and none of them is fully settled, which is kind of refreshing honestly; not everything needs a tidy answer. One theory is called selective accessibility. The idea is that once you’re given an anchor, your brain starts searching for information consistent with that anchor, almost testing the hypothesis “is this number close to true?” And in doing that search, you end up finding and weighting evidence that confirms the anchor, ignoring stuff that would push you away from it.

Another explanation leans more on effort-adjusting away from an anchor takes mental work, and people are, generally speaking, mentally lazy. Not in a bad way. Just efficient, or trying to be. So the brain stops adjusting before it’s gone far enough, because going further costs energy and the current estimate feels “close enough.”

There’s also a numeric priming angle, where just being exposed to a number primes related numerical concepts in memory, making them more available when you’re forming a judgment. This one gets debated a lot in the literature because it’s hard to separate from the other two explanations.

It shows up in places you wouldn’t expect

Courtrooms, apparently. Judges given higher sentencing recommendations by prosecutors-even absurdly high, arbitrary ones hand down longer sentences afterward. There’s a study where researchers had judges roll dice before sentencing decisions and the dice roll still nudged their sentences. Judges. Trained legal professionals. Anchored by dice.

Medical diagnoses too, sometimes. A doctor who hears an initial suggested diagnosis first; even one that turns out wrong can stay tethered to it longer than they should, missing symptoms that point elsewhere. This is actually a known problem in clinical decision-making training now, they specifically warn new doctors about it.

And in everyday estimation tasks, like guessing how long a project will take. If someone says “this’ll probably take two weeks” before you’ve even thought about it yourself, your own estimate gets pulled toward two weeks, whether that’s realistic or not.

Related: The Zeigarnik Effect: Why Unfinished Tasks Keep Running in Your Head

Can you avoid it?

Not completely, probably never completely, because the bias operates below conscious awareness a lot of the time. But being aware that anchors exist does seem to reduce their pull somewhat, not eliminate it, just soften it.

Some decision psychology researchers suggest deliberately generating your own estimate before hearing anyone else’s number. Kind of an anchor of your own, self-created, that you can compare against externally offered ones. Others suggest actively arguing against the anchor in your head like, if someone says a used car is worth $12,000, force yourself to list reasons it might be worth less, on purpose, as a kind of mental exercise.

It doesn’t fully work. People still anchor even when warned about anchoring beforehand, which is almost funny in a depressing way. Knowing about the bias doesn’t make you immune to it. That’s true of most cognitive biases honestly, awareness helps a little but it’s not a cure.
Related: 8 Signs of Decision Fatigue

A final thought 

The anchoring effect isn’t really a flaw in reasoning so much as it’s a shortcut that mostly works fine in low-stakes situations and misfires in high-stakes ones: negotiations, courtrooms, big purchases. It’s one of those biases that feels almost too simple to be real, and yet it shows up in dice-rolling judges and wheel-spinning college students and grocery store discount tags alike. Same mechanism, wildly different settings.

Maybe the most useful thing is just knowing it’s there. Not fixed, not solved, just… there, quietly nudging judgments before the actual thinking even starts.

FAQs

1. What is the anchoring effect in simple terms? 

The anchoring effect is when the first number or piece of info you see shapes your later judgments, even if it’s irrelevant.

2. Is anchoring bias the same as anchoring effect? 

Mostly yes, the terms get used interchangeably in most psychology writing.

3. How is anchoring used in negotiations? 

Whoever states the first number sets the range the rest of the conversation revolves around.

4. Can anchoring be avoided completely? 

Not fully-even people warned about it still show anchoring in studies.

5. Why do stores use price anchoring? 

Showing a higher “original” price makes the discounted price feel like a better deal than it might actually be.