Kelly Criterion
Bet size optimized to maximize long-run growth without ruin.
"Bet too big and you blow up. Bet too small and you starve."
What is Kelly Criterion? Bet size optimized to maximize long-run growth without ruin. Sizing big bets so the org can survive losing them.
Position sizing in investing and in capital allocation.
Sizing big bets so the org can survive losing them.
Size every major bet by survivability, not just expected value.
You have a 60% edge on a fair-odds bet. What fraction of your bankroll should you stake per round to maximize long-run wealth?
Don't gut it. Use the formula.
Pick a reaction to Kelly Criterion
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The full taxonomy entry
Every concept in the Atlas uses the same structure — so Kelly Criterion 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 Kelly Criterion most often show up unnoticed?
- Which metric, ritual, or contract clause quietly rewards Kelly Criterion?
- If we removed every payoff for Kelly Criterion, what behavior would replace it?
- Who benefits when Kelly Criterion persists — and who pays the cost?
- People defend the status quo using the language of kelly criterion.
- 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 Kelly Criterion through 2 lenses
Each layer of the Incentives OS reframes this concept with its own thinkers, vocabulary, and diagnostic question.
Do you actually know Kelly Criterion?
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Which best describes Kelly Criterion?
Worked example, counter-example & concept map
On-demand AI analysis grounded in the Lab's research. Cached on your device after first run.
When you encounter Kelly Criterion, 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.
See Prefrontal in the Brain Atlas →Picked for you, from the Atlas
Ranked by shared learning paths, overlapping chips, and what you've saved.
Ignoring general statistics in favor of specific, vivid information.
Posterior = (likelihood × prior) / evidence.
Update beliefs in proportion to the strength of new evidence.
Start with a prior; update with new evidence.
Novices experiencing early success, often due to variance and small samples.
High-impact, hard-to-predict, retrospectively explainable events.
Send the card, not just the link
A pre-rendered social card with the title, eyebrow, and URL. Copy the link, post it anywhere, or download the SVG for slides.
More definitions to follow
Every term in the Atlas connects to a dozen others. Pick any of these and see where it takes you.
Where you can go is constrained by where you've been.
Changing the meaning of an experience by changing the frame around it.
Spread learning over time for stronger retention.
Old systems decline as new ones emerge in parallel; leaders steward both, not just kill the old or chase the new.
Stages of organizational AI capability.
Behaviors spread through groups via observation and imitation.
Systematic deviations from rationality in judgment.
Sort situations into Clear, Complicated, Complex, Chaotic, or Confused — each needs a different response.
People, tasks, and inputs that quietly drain disproportionate energy relative to value returned.
The same information lands differently depending on how it's wrapped.
Deliberately shaping how others perceive you — through behavior, signal, and context.
Markets fail to allocate resources efficiently on their own.