Look for decisions with asymmetric upside — large potential gain, small defined loss
Seek situations where the worst case is bounded and small while the best case is large and open-ended.
Why it works
Traditional EV analysis weights gains and losses symmetrically, but many opportunities have a fundamental asymmetry: the downside is capped (the cost of a book, the time for a cold email, the fee for a course) while the upside is large and uncertain. These are optionality plays — Nassim Taleb’s "antifragile" positions — where the math is favorable without needing to know the exact probability of success.
How to do it
- For any opportunity, identify the worst realistic outcome and ask: "Can I absorb this?"
- If yes, ask: "Does the upside have a meaningful right tail — outcomes much larger than the likely ones?"
- If the downside is survivable and the upside is open-ended, the decision is often worth taking at almost any low-to-moderate probability.
- Actively seek this type of option: low-cost experiments with potentially large payoffs.
Evidence
Options theory in finance formalizes asymmetric payoffs; the practical version — taking cheap experiments with large right-tail upside — is endorsed across decision theory, entrepreneurship research, and Taleb’s empirical finance work. (mechanistic)
Asymmetric upside thinking can be misused to justify many low-probability speculative bets; the key qualifier is that the downside must be genuinely survivable, not merely "maybe I can handle it."
Common mistake
Evaluating asymmetric opportunities by the probability of the most likely outcome (failure) rather than by the expected value including the low-probability large upside.
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More practices for Expected Value Thinking: Deciding Under Uncertainty
- Enumerate scenarios and their probabilities before deciding
Write down each meaningful outcome, assign a probability, and compute the weighted total.
- Judge decisions by the process, not the result
A good decision that produces a bad outcome is still a good decision.
- Calculate the expected value of gathering more information
Before researching further, ask whether the additional information is actually worth the cost to obtain.
- Adjust raw expected value for risk aversion on large stakes
A 50% chance of losing everything is not equivalent to a certain 50% loss — adjust for your actual risk tolerance.
- Accept positive-EV decisions even when they feel uncomfortable
If the expected value is clearly positive, take the decision — even if most individual outcomes are losses.
- Keep a decision journal to score your EV estimates
Log your probability estimates and payoff predictions, then compare them to what happened.
Related concepts
- Bayesian Thinking: How to Update Beliefs Rationally
Holding beliefs as probabilities and updating them when evidence arrives
- Thinking, Fast and Slow, Made Usable
Two systems, the biases they create, and when to slow down
- Mental Models: Charlie Munger’s Latticework Approach
Building the multi-disciplinary toolkit that lets you see what single-discipline thinkers miss
- Opportunity Cost Thinking: What You Give Up When You Choose
The hidden price of every choice — and the practices that make it visible