Self-Attribution Bias
heuristics
overconfidence
When one attributes successful outcomes to their personal abilities but unsuccessful ones to external factors or “sabotage”. This leads to overconfidence, as one might expect!
When one attributes successful outcomes to their personal abilities but unsuccessful ones to external factors or “sabotage”. This leads to overconfidence, as one might expect!
Successes in business attempts become evidence of skill, while failures become evidence of unfair external factors at play. Neither attribution enables accurate self-assessment.

Also relates to: Overconfidence · Confirmation Bias · Hindsight Bias · Illusion of Control · Causality and Attribution