What is the availability heuristic?

A mental shortcut where we judge how common or likely something is by how easily examples come to mind, which over-weights vivid and recent events.

Amos Tversky and Daniel Kahneman, in the early 1970s.

How does it mislead us?

Dramatic, well-publicised events feel more frequent than they are, so we fear rare vivid risks and ignore common dull ones. The fix is to check base rates.

The availability heuristic

Also called if it comes to mind, it must be common · Cognitive psychology

The availability heuristic is our habit of judging how likely or common something is by how easily examples spring to mind. Vivid, recent, or heavily-reported events feel frequent; quiet or abstract ones feel rare — so memorability, not actual frequency, drives our sense of the odds.

How it works

Estimating true frequencies is hard, so the mind substitutes an easier question: how readily can I recall an instance? Ease of recall usually tracks frequency — but it’s inflated by drama, recency, and media coverage, so the substitution misfires exactly when examples are memorable for reasons other than how often they happen.

How to use it

Reaching for base rates and statistics instead of the story that first comes to mind.
Discounting fears driven by vivid headlines — plane crashes, shark attacks — against the dull, common risks.
Noticing that “I keep hearing about X” measures coverage, not frequency.

Worked example

After a plane crash makes the news, people overestimate the danger of flying and some drive instead — even though driving is far more dangerous per mile. The crash is available and vivid; the millions of safe flights and the steady toll of car accidents are not.

Where it fails

You can’t switch it off, and often you must decide before real data is at hand. The workable habit is to treat ease-of-recall as a clue to be checked, not an answer — and to ask what’s memorable but rare, versus common but forgettable.

The deeper point

Its quiet distortion is that the media and your memory share a taste for the dramatic, so the risks you feel most vividly are often the ones least worth fearing. The fix is a reflex: when a judgment rests on “what comes to mind,” ask what doesn’t.

Frequently asked

What is the availability heuristic?: A mental shortcut where we judge how common or likely something is by how easily examples come to mind, which over-weights vivid and recent events.
Who described it?: Amos Tversky and Daniel Kahneman, in the early 1970s.
How does it mislead us?: Dramatic, well-publicised events feel more frequent than they are, so we fear rare vivid risks and ignore common dull ones. The fix is to check base rates.

Signal vs noise Survivorship bias Regression to the mean Confirmation bias Wikipedia: Availability heuristic

The books behind better thinking

Thinking, Fast and Slow — Daniel Kahneman
The Art of Thinking Clearly — Rolf Dobelli
The Great Mental Models, Volume 1 — Shane Parrish
Poor Charlie’s Almanack — Charlie Munger
Super Thinking — Gabriel Weinberg & Lauren McCann
Seeking Wisdom — Peter Bevelin

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Editorial synthesis © ReadGlobe 2026, drawing on the mental-models tradition (Charlie Munger, Farnam Street) and the primary sources for each model. · Last reviewed 2026-07-01.