No. 301 · Your own mind · Psychology
Hindsight Bias
Once we know how things turned out, the outcome seems to have been obvious all along.
In the Almanac
““I knew it would happen””, 1972–1975 · “Evergrande”, 2020–2024
Both stories in full, three ways to use it and where it misleads.
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Questions
What is Hindsight Bias?
Hindsight bias is the 'I knew it all along' effect. Once we learn an outcome, our memory quietly rewrites what we expected, making surprises look obvious and making us overconfident about predicting the future.
How do you avoid Hindsight Bias?
To counter it, write down your predictions and reasons before results arrive, then compare. When judging past decisions, yours or anyone else's, ask what could reasonably have been known at the time, not what is known now.
When does Hindsight Bias matter?
Hindsight Bias is one of the 31 mental models for your own mind, the situations where you ask: Is my own thinking leading me astray? Within that, it belongs to “Seeing what you want to see”, alongside Blind Spot Bias, Cognitive Dissonance and Commitment and Consistency Bias.
What is an example of Hindsight Bias?
Two stories show it at work: “I knew it would happen” (1972–1975) and Evergrande (2020–2024). Both are told in full in The Mental Models Daily Almanac, which has two stories for each of its 365 models.
Which mental models are related to Hindsight Bias?
Post Mortem, Narrative Instinct and Counterfactual Thinking. Hindsight Bias itself comes from psychology.