Case file
Optimism Bias
- Filed under
- Need To Act Fast
The charge
We expect our future to go better than base rates justify, especially for risks, timelines, and outcomes under our control.
How it operates
Positive scenarios are easier and more motivating to imagine than obstacles, so friction and bad luck get underweighted.
Logged incidents
- Incident 01
A startup plan assumes a sales ramp faster than almost all comparable launches.
- Incident 02
An engineering leader expects a migration to finish without major incidents despite a messy dependency map.
- Incident 03
An investor focuses on upside narratives while discounting dilution and execution risk.
What to watch for
It shows up when plans sound smooth and downside cases feel like edge cases. Ask: 'What would the outside view predict for a case like this?'
Recommended action
Use reference-class forecasting and a premortem before committing resources.
Known associates
- Overconfidence EffectPeople's confidence in their judgments often exceeds their actual accuracy, especially for predictions,…
- Social Desirability BiasPeople report attitudes or behaviors that make them look good to others instead of what is most accurate or…
- Third-Person EffectWe tend to believe persuasive messages, misinformation, or manipulation affect other people more than they…
- False Consensus EffectWe overestimate how much other people share our beliefs, preferences, and habits.
- Hard-Easy EffectOn hard tasks we are usually too confident, and on easy tasks we are often not confident enough.
- Lake Wobegon EffectMost people rate themselves as above average on desirable qualities, even when that cannot be true for…
Source of record