Anchoring Bias: How the First Number You See Distorts Every Decision That Follows

In a classic experiment, participants were asked to spin a wheel (rigged to land on either 10 or 65) before estimating the percentage of African countries in the United Nations. The wheel was clearly random and obviously irrelevant. Yet people who spun a 65 gave estimates nearly double those of people who spun a 10.

The irrelevant number shaped the answer. That is anchoring.

What anchoring does to real decisions

Anchoring is most visible in negotiations, but it operates in virtually every decision involving a number. The salary at your last job becomes the anchor for what the next salary should feel like. The price you paid for a stock becomes the anchor for what it is "worth." The first apartment you see sets the reference point for every apartment you see after.

In career decisions, the anchor is often compensation: people frame whether a new opportunity is "good" relative to their current package, rather than relative to market rates or the value of the work itself.

In investment decisions, the purchase price is the most powerful anchor. Investors hold losing positions far longer than they should because selling below the purchase price feels like a worse outcome than the forward-looking numbers justify.

Why anchoring is so persistent

Anchoring persists because estimation under uncertainty is hard, and first information fills the gap. When you do not know the "right" answer to something, the first number you encounter gives you a starting point — and adjustments from starting points are systematically insufficient. We adjust, but not far enough.

Knowing about anchoring does not reliably protect against it. In studies where participants were explicitly warned that the initial anchor was random, they still anchored to it, just slightly less. The bias operates below the level of conscious reasoning.

How to work against anchoring

The most effective counter is generating your own independent estimate before you encounter the anchor. Before you see the listed price of a property, ask yourself what you think it is worth. Before you open a salary negotiation, research market rates and form your own number. The prior commitment to an independent estimate reduces the anchor's influence.

In decisions where the anchor is unavoidable — you have already seen the number — try to evaluate the decision as if you had not. What would the rational choice be if you were starting from scratch? What does the forward-looking analysis say, independent of where things started?

If anchoring might be pulling at a decision you are currently making, Resolve is designed to surface it — to ask the questions that reveal where your reasoning has been shaped by information that should not be doing as much work as it is.