Availability Heuristic
Type: Cognitive Bias
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Definition
We judge frequency and probability by how easily examples come to mind.
Vivid, recent, emotional events seem more common than they are. Boring, distant, statistical realities fade from memory.
Why It Matters
Media distortion: Plane crashes feel common (news coverage) but driving is deadlier. Fear: Shark attacks vs drowning — which is more likely? Investing: You remember the stock you almost bought that soared. Judgment: “Everyone I know…” — Your social circle ≠ the world.
Examples
| Actual Risk | Perceived Risk | Why |
|---|---|---|
| Driving | Low | Common, familiar |
| Flying | High | Rare crashes are news |
| Terrorism | High | Vivid, emotional |
| Heart disease | Low | Boring, slow |
The Mechanism
- Vividness — Emotional events stick
- Recency — Yesterday’s news feels current
- Personal experience — What happened to you feels universal
- Media coverage — Covered = important
Fighting It
- Seek data — Base rates, statistics, facts
- Consider the opposite — “When did this NOT happen?”
- Broaden sample — Look beyond your circle
- Time perspective — “In the last 10 years, how often…?”
Related Biases
- Confirmation Bias — Available examples confirm beliefs
- Affect Heuristic — Emotional availability
- Recency Bias — Recent = available
Audio
Podcast episode: Availability Heuristic
Part of the Cognitive Bias Reference