Anchoring Bias: Why First Numbers Stick in Our Minds

Anchoring Bias: Why First Numbers Stick in Our Minds

 Anchoring bias explains why the first number or piece of information we see shapes our decisions. Learn how it works and how to reduce its influence.

Introduction: The Power of the First Number

Imagine walking into a store and seeing a jacket priced at €300 — but it’s on sale for €150. Even if €150 is still expensive, it feels like a bargain compared to the first price. This is anchoring bias at work — a cognitive bias where the first number or piece of information we encounter becomes a mental “anchor” that shapes our judgment.

Anchoring bias affects everything from shopping and salary negotiations to medical decisions and everyday life. By understanding how it works, we can learn to spot when our choices are being unconsciously steered.

What Is Anchoring Bias?

Anchoring bias is a mental shortcut where people rely too heavily on the first piece of information (the “anchor”) when making decisions. Even when the anchor is arbitrary, it influences estimates and choices.

First studied by Amos Tversky and Daniel Kahneman in 1974, this bias highlights how easily our brains can be primed by irrelevant numbers.

How Anchoring Bias Works

  1. Initial Exposure: The first number or fact sets a reference point.

  2. Adjustment: We adjust away from the anchor — but usually not enough.

  3. Final Decision: The outcome is biased toward the original anchor, even if it’s irrational.

Example: When asked if Gandhi died before age 140, then to guess his actual age, people give higher estimates than if the first question used “age 9.”

Everyday Examples of Anchoring Bias

  • Shopping: Sales tags (original price vs. discounted price).

  • Negotiation: The first salary offer heavily influences the final agreement.

  • Real estate: Listing price shapes how buyers value a house.

  • Legal settings: Judges’ sentencing can be influenced by initial numbers, even irrelevant ones.

  • Personal finance: Seeing a “high” number first can make subsequent expenses seem small.

Why Anchoring Happens

  • Cognitive effort: It’s easier to rely on the first number than to calculate from scratch.

  • Priming effect: Initial information activates related ideas in memory.

  • Unconscious influence: Even when people know anchors are irrelevant, they still affect decisions.

Risks of Anchoring Bias

  • Overpaying in negotiations or purchases.

  • Making poor investment decisions.

  • Misjudging risks or probabilities.

  • Allowing irrelevant information to sway important life choices.

How to Reduce Anchoring Bias

  1. Pause Before Deciding
    Give yourself time to evaluate information without rushing.

  2. Seek Independent Data
    Look for objective sources (e.g., market values, expert advice).

  3. Generate Your Own Anchor
    Set a personal reference point before hearing external numbers.

  4. Awareness Training
    Simply knowing about anchoring reduces its influence, though not completely.

Anchoring Bias in Psychology and Business

  • Marketing: Anchoring drives pricing strategies, “limited-time offers,” and luxury branding.

  • Health decisions: Patients’ understanding of risks can be shaped by the first statistic presented.

  • Behavioral economics: Anchoring shows how humans deviate from rational decision-making models.

Conclusion: Anchors Can Be Loosened

Anchoring bias is powerful, but not unbreakable. By recognizing when first numbers are shaping decisions, seeking objective data, and setting our own benchmarks, we can loosen the anchor’s hold.

written by,

Martin Rekowski 17. Februar 2026 

External Source Suggestion

  • Tversky, A., & Kahneman, D. (1974). Judgment under uncertainty: Heuristics and biases. Science, 185(4157), 1124–1131.

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