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Mind & biases2 MINBrief fileEstablished evidence

Ambiguity Aversion

One urn states its odds; the other stays silent. The prize can be identical.

01 / SUMMARY

In short

Many people prefer risks with known probabilities over options whose probabilities are uncertain. That preference for defined information can produce choices that do not fit one coherent probability calculation.

03 / SCENE

In the wild

Someone chooses to bet on red in a 50/50 urn over one with an unknown mix, then makes the same choice when betting on black.

04 / LIMIT

The limit

Avoiding unknown uncertainty is not always a bias; it may reflect distrust or missing information with real value.

FINAL NOTE

What remains

Separate the possible outcome from confidence in its estimate, then decide what reducing that uncertainty is worth.

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Editorial review: 2026-08-06

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