What Anchoring Bias Is
Anchoring bias is the tendency to rely too heavily on the first piece of information encountered — the anchor — when making subsequent judgments, even after new, more relevant information becomes available. The concept was popularized by psychologists Daniel Kahneman and Amos Tversky.
Common Anchors in Investing
The most common anchor is an investor’s own purchase price. When a stock falls below that price, investors often delay selling while waiting to “get back to even,” and when it rises above that price, they feel a sense of relief — even though the purchase price has no bearing on the stock’s current fair value.
| Common Anchor | Resulting Distortion |
|---|---|
| Purchase price | Delaying a sale until reaching break-even |
| All-time high | Mistaking a large drawdown for being “cheap” |
| Analyst’s initial price target | Underreacting to subsequent changes in fundamentals |
The All-Time-High Anchor
Judging a stock as “cheap” purely because it has fallen far from its all-time high is another classic anchoring trap. If the company’s fundamentals — earnings power, growth outlook — have deteriorated significantly since that high was set, the old peak carries no useful information about the stock’s current fair value.
Why It’s So Hard to Escape
Research suggests the human mind tends to form judgments by adjusting away from an already-known reference point rather than starting fresh, and that adjustment is typically insufficient — leaving the final judgment anchored close to the original number.
Practical Ways to Reduce Anchoring
Deliberately ignoring your purchase price and reframing the question as “would I buy this today, at this price, with what I know now” — or resetting a price target using only the latest fundamentals and valuation metrics — are commonly cited techniques for reducing anchoring’s influence.
Frequently Asked Questions
Do professional investors fall for anchoring too?
Yes — studies have found that even sell-side analysts tend to adjust their initial price targets only incrementally over time, suggesting professionals are not immune to the bias.
How does anchoring differ from confirmation bias?
Confirmation bias is selectively favoring information that supports an existing belief, while anchoring is fixating on a specific reference number — though in practice, a purchase-price anchor combined with loss aversion often makes it even harder to sell at a loss.
Does anchoring show up outside of investing?
Yes — anchoring is widely observed in negotiations and consumer pricing, where the first number mentioned tends to shape the entire subsequent range of discussion.
Can an IPO price become an anchor?
Yes — investors often use the IPO price as a psychological reference point for judging whether a stock is “cheap” or “expensive” post-listing, even though it may have little connection to current fair value.
Key Takeaways
Anchoring bias causes investors to fixate on reference points like purchase price or past highs, and deliberately reframing decisions around current fundamentals is a practical way to reduce its influence. This article is for informational purposes only and does not constitute investment advice.
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