Strip the narrative and restate as a bare frequency claim

Translate the vivid scenario into a dry statistical question to see if it still feels probable.

Why it works

Rich narratives engage the brain’s pattern-matching and story-comprehension systems, which are optimized for coherence and causal plausibility — not probability. Translating "Linda is a feminist bank teller" into "what percentage of bank tellers are feminist activists?" moves the question from the associative system to a more calibrated numerical frame. Frequency format is consistently easier for people to reason about correctly than probability format, as Gigerenzen’s research on natural frequencies demonstrates.

How to do it

1. Restate the claim in frequency form: "Out of 100 people with this background, how many would have both of these properties?"
2. Compare that estimate to the frequency of just one of the properties in the same group.
3. If the conjunction rate is higher than either component rate, you’ve caught a fallacy.
4. Use this restatement before making any decision that depends on the joint scenario being likely.

Evidence

Gigerenzen and Hoffrage (1995) showed that natural frequency formats dramatically improve probabilistic reasoning accuracy compared to probability percentages — the conjunction fallacy rate drops substantially in frequency format. Fiedler (1988) traced part of the effect to subtle linguistic framing, finding that rewording the task to make the frequency question explicit sharply lowers the fallacy rate — evidence that the narrative wording itself, not just innumeracy, drives the error. (rct)

Frequency framing reduces but does not eliminate the fallacy; some individuals still commit it in frequency format, especially under time pressure.

Sources

• Gigerenzen & Hoffrage (1995), How to improve Bayesian reasoning without instruction, Psychological Review
• Gigerenzer, G., & Hoffrage, U. (1995). How to improve Bayesian reasoning without instruction: Frequency formats. Psychological Review, 102(4), 684–704.
• Fiedler, K. (1988). The dependence of the conjunction fallacy on subtle linguistic factors. Psychological Research, 50(2), 123–129.

Common mistake

Translating to frequency format but keeping the narrative framing intact ("how many people like Linda…"), which still activates representativeness — the restatement must be genuinely dry.