Availability-Misweighing Tendency

intermediate2 min readbusiness · economics · psychology

The tendency to overweigh information that is easily available in memory, leading to distorted perceptions and decisions. It stems from the brain's limited capacity and reliance on readily accessible data.

THE IDEA

AVAILABILITY-MISWEIGHING TENDENCY

The nasty thing about the availability bias is that it insidiously distorts our view of the world by distorting our perception of past events and our environment.

—Leonard Mlodinow

This mental tendency echoes the words of the song: “When I’m not near the girl I love, I love the girl I’m near.” Man’s imperfect, limited-capacity brain easily drifts into working with what’s easily available to it. And the brain can’t use what it can’t remember or what it is blocked from recognizing because it is heavily influenced by one or more psychological tendencies bearing strongly on it, as the fellow is influenced by the nearby girl in the song. And so the mind overweighs what is easily available and thus displays Availability-Misweighing Tendency.

Antidotes

The main antidotes to miscues from Availability-Misweighing Tendency often involve procedures, including use of checklists, which are almost always helpful.

Another antidote is to behave somewhat like Darwin did when he emphasized disconfirming evidence. What should be done is to especially emphasize factors that don’t produce reams of easily available numbers, instead of drifting mostly or entirely into considering factors that do produce such numbers. Still another antidote is to find and hire some skeptical, articulate people with far-reaching minds to act as advocates for notions that are opposite to the incumbent notions.

Consequences and Uses

One consequence of this tendency is that extra vivid evidence, being so memorable and thus more available in cognition, should often consciously be underweighed while less vivid evidence should be overweighed.

Still, the special strength of extra-vivid images in influencing the mind can be constructively used

1. in persuading someone else to reach a correct conclusion or
1. as a device for improving one’s own memory by attaching vivid images, one after the other, to many items one doesn’t want to forget.

Indeed, such use of vivid images as memory boosters is what enabled the great orators of classical Greece and Rome to give such long, organized speeches without using notes.

The great algorithm to remember in dealing with this tendency is simple: An idea or a fact is not worth more merely because it is easily available to you.

When to use it

A project manager uses a pre-defined checklist of criteria to evaluate proposals, ensuring that memorable but low-impact features don’t skew the scoring.
An investor deliberately reviews a list of forgotten, boring stocks with steady fundamentals to counteract the allure of recent headlines.
A teacher attaches vivid mental images to abstract concepts to enhance student memory and later recall.
A negotiator consciously underweighs a counterpart’s emotionally charged anecdote and instead focuses on statistical evidence or long-term trends.

FROM THEORY TO EVERYDAY LIFE

In practice

Employee Performance Review

A manager overweighs an employee’s recent accomplishments or failures during annual review because they are top of mind, ignoring the full scope of performance over the entire year.

Investment Decisions

Investors overreact to highly publicized company news (vivid) and chase hot stocks, while underweighting less sensational but more predictive data like long-term fundamentals.

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A MOMENT TO REFLECT

Put it to work.

When making a recent decision, did you lean toward the most memorable or vivid information rather than the most accurate?
How can you systematically seek out less vivid, hard-to-recall data that might be highly relevant?
What checklist or disconfirming evidence approach could you use to balance availability in your thinking?