Base Rate Neglect
We ignore underlying probabilities in favor of vivid specifics.
"The story is true. The story is also rare. Both can be true."
What is Base Rate Neglect? We ignore underlying probabilities in favor of vivid specifics. Risk programs that miss the modal failure while obsessing over the dramatic one.
Fearing a rare disaster while ignoring the common one happening right now.
Risk programs that miss the modal failure while obsessing over the dramatic one.
AI ethics worried about sci-fi scenarios; current-day misuse unaddressed.
Always state base rates alongside narratives.
A disease affects 1 in 1,000. The test is 99% accurate. You test positive. What's the chance you have it?
Don't compute. Gut it.
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The full taxonomy entry
Every concept in the Atlas uses the same structure — so Base Rate Neglect can be compared, recombined, and cited like an element on a periodic table.
- Business
- Leadership
- Government
- Healthcare
- Education
- Sales
- Marketing
- AI
- Negotiation
- Media
- Public Policy
- Relationships
- Where in our org would Base Rate Neglect most often show up unnoticed?
- Which metric, ritual, or contract clause quietly rewards Base Rate Neglect?
- If we removed every payoff for Base Rate Neglect, what behavior would replace it?
- Who benefits when Base Rate Neglect persists — and who pays the cost?
- People defend the status quo using the language of base rate neglect.
- Decisions cluster around the easiest narrative rather than the strongest evidence.
- New data changes the slide deck but not the decision.
- Anyone naming the pattern is treated as the problem.
Every Atlas entry is a node in a knowledge graph. See the related rail below to follow the connections.
See Base Rate Neglect through 3 lenses
Each layer of the Incentives OS reframes this concept with its own thinkers, vocabulary, and diagnostic question.
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Which best describes Base Rate Neglect?
Worked example, counter-example & concept map
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When you encounter Base Rate Neglect, your prefrontal cortex has to do extra work to override the automatic response — and that override budget is finite.
Executive control, planning, impulse override, working memory, System 2. First thing to go offline under stress, fatigue, or low blood sugar. Why your 4pm decisions are worse than your 9am ones.
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Ranked by shared learning paths, overlapping chips, and what you've saved.
We prefer known risks to unknown ones, even when the unknown is better.
Believing a specific scenario is more likely than its more general one.
Believing past random events influence future independent ones.
Believing streaks predict future streaks.
Underestimating the probability of bad outcomes — especially to us.
Overestimating the probability of bad outcomes.
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More definitions to follow
Every term in the Atlas connects to a dozen others. Pick any of these and see where it takes you.
Reasoning from foundational truths rather than from analogy or convention.
Symptoms or beliefs spread through a group with no underlying physical cause.
Expecting change to happen at a constant rate.
Observe, Orient, Decide, Act — faster than your competitor.
Caseloads far above professional norms guarantee weak defense for the poor.
Painful self-evaluation against a social standard.
Modeling what others think, want, and will do.
Your capacity to learn, unlearn, and relearn faster than the environment changes.
Augment when judgment matters. Automate when scale matters.
Inputs combine under conditions to produce new outputs — sometimes irreversibly.
Operating economics shaped by per-token pricing.
Asset prices fully reflect available information; you can't reliably beat the market.