# Anchoring

> Anchoring makes traders rely too heavily on one reference number, like an entry price or an old high. Learn how it distorts decisions and how to adjust properly.

Source: https://learn.tradelabsai.com/psychology/anchoring/  
Track: Trading Psychology · Level: Intermediate · Updated: 2026-10-03  
Publisher: TradeLabs AI (https://tradelabsai.com). Education, not financial advice.  
Cite as: TradeLabs Learn, "Anchoring", https://learn.tradelabsai.com/psychology/anchoring/

Anchoring is the tendency to rely too heavily on the first piece of information you see, or on one reference number, when making a judgement. Psychologists Amos Tversky and Daniel Kahneman showed in the 1970s that even random numbers can shift people's estimates. In trading, anchors are everywhere: the price you paid, a stock's all time high, a target from an analyst, last year's level or a round number.

## The classic experiment

In a well known 1974 study, Tversky and Kahneman spun a wheel of fortune rigged to land on either 10 or 65, then asked participants to estimate the percentage of African nations in the United Nations. Those who saw 10 gave a median estimate of 25%; those who saw 65 gave a median estimate of 45%. A number they knew was random changed their answers by 20 percentage points. If a meaningless number can do that, a meaningful looking number such as your entry price can do far more.

## Common anchors in trading

| Anchor | How it distorts decisions |
|---|---|
| Your entry price | Holding losers "until break even"; taking profits too early |
| All time or 52 week high | Thinking a fallen stock is "cheap" just because it was higher before |
| Analyst price targets | Treating an estimate as a destination |
| Round numbers | Expecting $100 or 1.2000 to matter regardless of context |
| Your original forecast | Refusing to update when new information arrives |
| Previous account peak | Taking big risks to get back to a past high balance |

**Example: The "cheap" stock**
A stock fell from $200 to $80. An investor buys, reasoning that it is "60% off". But the price fell because the company's earnings outlook collapsed. Relative to its new earnings, $80 may be expensive. The investor anchored to $200, a price that reflected information that no longer applies. Six months later the stock is at $55.

## When reference levels are useful

Not every reference number is a bias. Many traders watch prior highs, lows and round numbers because other traders watch them too, which can create real buying and selling interest at those levels. The difference is in how you use them:

- **Useful:** "Many orders may sit near the prior high, so I expect a reaction there." See [Support and Resistance](https://learn.tradelabsai.com/price-action/support-and-resistance/) and [Psychological Levels](https://learn.tradelabsai.com/price-action/psychological-levels/).
- **Anchoring:** "It used to trade at the prior high, so it must go back there."

A level is a place to watch for a reaction, never a promise that price will reach it.

## Anchoring and updating

Anchoring also makes people adjust too little when new information arrives. Analysts and traders who start with a forecast tend to revise it in small steps, even when news calls for a big change. This slow adjustment is one explanation offered for effects like [Earnings Reactions and Post-Earnings Drift](https://learn.tradelabsai.com/fundamentals/post-earnings-drift/), where prices keep moving in the direction of an earnings surprise for weeks after the report.

The same thing happens in your own trading. If you decided last week that a market was bullish, you may read this week's weak data as a temporary blip instead of a reason to change your mind.

## How to reduce anchoring

1. **Judge positions on current value,** not on your entry price. See [Sunk Cost Fallacy](https://learn.tradelabsai.com/psychology/sunk-cost-fallacy/).
2. **Ask what has changed** before using any historical price as a reference.
3. **Use valuation, not past price,** when asking whether something is cheap. See [Valuation Basics](https://learn.tradelabsai.com/fundamentals/valuation-basics/).
4. **Make a range of scenarios** rather than a single target.
5. **Write down what would change your view,** and update fully when it happens. See [Confirmation Bias](https://learn.tradelabsai.com/psychology/confirmation-bias/).
6. **Measure risk in percentages of your account,** not against a past peak balance. See [Maximum Drawdown](https://learn.tradelabsai.com/portfolio/maximum-drawdown/).

## Common mistakes

- **"It was $X, so it's cheap now."**
- **Refusing to sell below the entry price.**
- **Treating a price target as a promise.**
- **Sizing up to win back a past account high.**

## Frequently asked questions

### What is anchoring bias in trading?

Relying too heavily on one reference number, such as an entry price or a past high, when judging what a market is worth or where it will go.

### Are support and resistance levels anchoring?

They can be used sensibly because many traders watch the same levels. Anchoring is assuming price must return to a past level without a current reason.

### How can I avoid anchoring?

Focus on current information and value, consider several scenarios and update your view fully when new evidence arrives.

Next, learn how hindsight distorts the way you judge past decisions in [Hindsight and Outcome Bias](https://learn.tradelabsai.com/psychology/hindsight-and-outcome-bias/).

## Sources

- Tversky, A. and Kahneman, D., Judgment under Uncertainty: Heuristics and Biases, Science, 1974. Summary: [Wikipedia, Anchoring effect](https://en.wikipedia.org/wiki/Anchoring_effect)

## Continue learning

- Next lesson: [Hindsight and Outcome Bias](https://learn.tradelabsai.com/psychology/hindsight-and-outcome-bias/)
- Previous lesson: [Sunk Cost Fallacy](https://learn.tradelabsai.com/psychology/sunk-cost-fallacy/)
- Related: [Sunk Cost Fallacy](https://learn.tradelabsai.com/psychology/sunk-cost-fallacy/): The sunk cost fallacy keeps traders in bad positions because of money already lost. Learn how it works, how it differs from loss aversion and how to break it.
- Related: [Disposition Effect](https://learn.tradelabsai.com/psychology/disposition-effect/): The disposition effect is the habit of selling winning trades too early and holding losers too long. Learn the research, what it costs and how to reverse it.
- Related: [Confirmation Bias](https://learn.tradelabsai.com/psychology/confirmation-bias/): Confirmation bias makes traders seek evidence that supports their view and ignore what contradicts it. Learn how it shows up and simple habits that counter it.
- Related: [Support and Resistance](https://learn.tradelabsai.com/price-action/support-and-resistance/): Support is where buying tends to stop a fall; resistance is where selling tends to stop a rise. Learn to draw levels, judge their strength and trade them well.
- Related: [Psychological Levels](https://learn.tradelabsai.com/price-action/psychological-levels/): Round numbers like $100 or Bitcoin at $100,000 attract orders and attention. Learn why psychological levels form, how price behaves there and how to trade them.