Definition
Anchoring bias (or anchoring effect) is the cognitive tendency to rely too heavily on an initial piece of information—the “anchor”—when making subsequent judgments. Even when the anchor is explicitly stated to be irrelevant, it influences estimates and decisions.
Key Findings
The Anchor Effect
- Initial numerical information serves as a reference point for judgment
- Subsequent estimates are adjusted insufficiently away from the anchor
- The adjustment process (anchoring, then adjusting) leaves people closer to the anchor than optimal
Persistence Despite Awareness
- Anchoring effects persist even when people are aware that the anchor is irrelevant
- Explicitly telling people the anchor is random does not eliminate the bias
- The effect is automatic and difficult to overcome through conscious effort
Examples
Negotiation
- First offer in a salary negotiation anchors expectations for the final amount
- Asking price for a house anchors the perceived fair value, even when the price is objectively unreasonable
Judgments and Estimation
- Random number generation followed by estimates (e.g., “Is the percentage of African nations in the UN higher or lower than that number?”) influences the final estimate
- Initial price seen for a product affects perceived value
Connections
behavioral-psychology
Anchoring bias is a core concept in behavioral-psychology, demonstrating systematic deviations from rational judgment.
framing-effects
Related to framing-effects—how information is presented influences perception and decision-making.
Implications
Decision-Making
Understanding anchoring can improve negotiations, pricing decisions, and risk assessments by making us aware of how initial numbers influence our thinking.
Manipulation
Awareness of anchoring can help recognize when anchors are being used strategically (e.g., in sales, negotiations) to bias judgments.