Anchoring Bias
Category: Decision Making
The tendency to rely too heavily on the first piece of information offered (the 'anchor') when making decisions.
How it works
When your brain has to estimate an unknown quantity, it doesn't pull a number from thin air. It grabs the nearest available figure and adjusts from there. The problem is that the adjustment is almost always too small, you start at the anchor and stop short, leaving your final judgment tethered to whatever number you happened to see first.
This happens because estimation is effortful and the anchor offers a free starting point. Once a number is in your head, it activates related associations and quietly shifts what feels 'reasonable,' even when you know the anchor is arbitrary. Studies have shown people's estimates move toward an anchor produced by an obviously random spin of a wheel.
The effect is strongest when you're uncertain, rushed, or dealing with something hard to value, a salary, a house, a settlement, a rare object. The murkier the true value, the harder you grip the anchor.
Where you'll see it
- A recruiter asks your *current* salary before making an offer; that figure silently caps the new offer, which is exactly why a growing number of states have banned the question.
- A real-estate listing prices a home at $899,000; even buyers who think it's overpriced negotiate down to $850k instead of the $760k the comparables actually justify.
- A menu lists a $120 'chef's reserve' steak almost no one orders, its real job is to make the $60 steak feel like the sensible, mid-range choice.
Where it comes from
Anchoring was demonstrated by Amos Tversky and Daniel Kahneman in their landmark 1974 Science paper 'Judgment Under Uncertainty: Heuristics and Biases.' In their famous experiment, participants spun a rigged wheel of fortune (landing on 10 or 65) and then estimated the percentage of African nations in the UN, those who saw the higher number gave dramatically higher estimates, despite the spin being visibly random.
How to counter it
Generate your own number first. Before you look at the asking price, the suggested tip, or the opening offer, write down what you independently think the thing is worth. An anchor you've never seen can't move you.
Argue the opposite extreme. If a number feels high, deliberately brainstorm reasons the true value is far lower (and vice versa). This forces a bigger adjustment than your brain wants to make and pulls you off the anchor.
In negotiations, anchor first or reframe. Whoever names the first number sets the gravity. If you can't go first, refuse to treat their figure as the starting line, restate the problem in your own terms and bring your own comparables to the table.
The tell
You're doing it when your 'independent' estimate lands suspiciously close to the first number someone happened to show you.