Anchoring Bias
AKA: "First Impression Bias"
The tendency to rely too heavily on the first piece of information offered (the "anchor") when making decisions.
What is Anchoring Bias?
The tendency to rely too heavily on the first piece of information offered (the "anchor") when making decisions.
Anchoring Bias is a cognitive bias in which the tendency to rely too heavily on the first piece of information offered (the "anchor") when making decisions. It occurs when priming. The first number sets the context for all subsequent judgments. For example, you see a shirt for $100, then see it on sale for $50. You think it's cheap. But is it worth $50? You are anchored to the $100.
The Trap (Example)
You see a shirt for $100, then see it on sale for $50. You think it's cheap. But is it worth $50? You are anchored to the $100.
Why This Matters
Anchoring Bias isn't just an abstract concept—it affects real decisions about money, relationships, career, and health. The cost of ignoring it compounds over time.
Mechanism of Action
This error is driven by Priming. The first number sets the context for all subsequent judgments..
Evolution optimized for speed and safety, not truth. Anchoring Bias is a byproduct of heuristics that once had adaptive value.
Real-World Examples
In investing: Anchoring Bias leads to holding losing positions too long or selling winners too early.
In relationships: This bias causes people to interpret ambiguous signals in ways that confirm existing beliefs about partners.
In work: Anchoring Bias makes it harder to update strategies when market conditions change.
In health: People ignore symptoms that contradict their self-image as "healthy" or "young."
Research Background
Experiments on Anchoring Bias often use controlled conditions that make the bias obvious to observers—yet participants still fall for it. This demonstrates how powerful the effect is.
Debug Protocol
Reject the initial number. Create your own independent estimate before looking at the "asking price."
Debiasing Strategies
Seek disconfirming evidence: Actively look for data that challenges your current belief.
Use decision journals: Write down predictions before outcomes are known, then review accuracy.
Consult diverse perspectives: People with different backgrounds spot different biases.
Implement decision rules: Pre-commit to criteria before emotionally charged situations arise.
Time-box decisions: Revisit important conclusions after a cooling-off period.
Related Reading
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Quick Facts
- Also Known AsFirst Impression Bias
- CategoryCognitive Bias
- PrevalenceUniversal
Other Cognitive Biases
- Confirmation Bias
- Dunning-Kruger Effect
- Sunk Cost Fallacy
- Availability Heuristic
- Negativity Bias
- Planning Fallacy
- Survivorship Bias
- Hindsight Bias
- Halo Effect
- Framing Effect
- Status Quo Bias
- Bandwagon Effect
- Optimism Bias
- Curse of Knowledge
- Authority Bias
- Recency Bias
- Peak-End Rule
- Spotlight Effect
- Illusion of Control
- Self-Serving Bias
- Actor-Observer Bias
- Just-World Hypothesis
- Gambler's Fallacy
- Hot Hand Fallacy
- Blind Spot Bias
- Mere Exposure Effect
- IKEA Effect
- Endowment Effect
- Zero-Risk Bias
- Normalcy Bias
- Hyperbolic Discounting
- Affect Heuristic
- Fundamental Attribution Error
- In-Group Bias
- Choice Overload
- Decoy Effect
- Outcome Bias
- Distinction Bias
- Projection Bias
- Restraint Bias
- Reactance
- Proportionality Bias
- Naive Realism
- Moral Licensing
Sources
- Kahneman, D. (2011). Thinking, Fast and Slow
- Tversky, A. & Kahneman, D. (1974). Judgment under Uncertainty
- Ariely, D. (2008). Predictably Irrational
References & Sources
Kahneman, D. (2011). Thinking, Fast and Slow. Farrar, Straus and Giroux.
Tversky, A., & Kahneman, D. (1974). Judgment under Uncertainty: Heuristics and Biases. Science, 185(4157), 1124-1131. https://doi.org/10.1126/science.185.4157.1124
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Anchoring Bias: Frequently Asked Questions
What is Anchoring Bias?+
The tendency to rely too heavily on the first piece of information offered (the "anchor") when making decisions.
Why is Anchoring Bias also called "First Impression Bias"?+
The alternate name "First Impression Bias" captures the intuitive essence of the bias. Anchoring Bias is the formal psychological term, while "First Impression Bias" describes what it feels like in practice.
How do I stop Anchoring Bias?+
Reject the initial number. Create your own independent estimate before looking at the "asking price."
Why does Anchoring Bias happen?+
The underlying mechanism is priming. the first number sets the context for all subsequent judgments.. Human brains evolved heuristics for speed and survival, not accuracy in modern contexts.
Can smart people fall for Anchoring Bias?+
Yes. Intelligence doesn't provide immunity—sometimes it makes the bias worse because smart people are better at rationalizing. Awareness and structured decision processes are more protective than raw IQ.
What's an example of Anchoring Bias in real life?+
You see a shirt for $100, then see it on sale for $50. You think it's cheap. But is it worth $50? You are anchored to the $100.
