Fallacy · Bad evidence
Survivorship bias
Also called: Looking only at the winners
Drawing conclusions from the cases that made it through a filter, and forgetting the ones that did not.
What it is
When we only see the successes (the businesses still open, the bands still playing, the planes that came back), we miss the failures that might have done exactly the same things. The missing cases can reverse the lesson.
An example
“Lots of famous founders dropped out of university, so dropping out leads to success.” The many dropouts whose businesses failed are not on magazine covers.
How to spot it
Ask who is missing from the picture: what happened to those who tried the same thing and failed?
How to answer it
“How many did the same and didn’t make it?”
When it is not a fallacy
Studying the survivors is fair when you also know how many started, so the successes can be set against the failures. Once the filter is counted, the cases that made it through are evidence.
Printable sheet of all fallacies
Cite or share this page
A plain reference you can paste into notes or an essay:
Quest2Reason. “Survivorship bias.” https://quest2reason.com/learn/ideas/fallacies/survivorship-bias. Accessed 13 November 2026.