Hindsight bias is the tendency to overestimate one's ability to have foreseen or predicted the outcome of an event.

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Hindsight bias is a well-established cognitive bias, also known as the "I-knew-it-all-along" phenomenon, where people tend to think that they knew or could have predicted the outcome of an event after it has already occurred, even if they did not actually have any prior knowledge or information to support their prediction.

Hindsight Bias Is the Tendency to Overestimate One's Ability to Have