守株待兔 (Shǒu Zhū Dài Tù) — Guarding the Tree Stump for Rabbits
The Concept
English: Survivorship Bias — Drawing conclusions from only the successes that survived a selection process, ignoring the failures that didn’t.
Chinese: 守株待兔 (Shǒu Zhū Dài Tù) — Guarding the tree stump, waiting for rabbits.
Cultural Origin
This parable from the Han Feizi (韩非子), circa 250 BCE:
A farmer in the state of Song was plowing when a rabbit ran into a tree stump and broke its neck, dying instantly. The farmer abandoned his plow and waited by the stump, hoping for more rabbits.
No more rabbits came. His fields went fallow. He became a laughingstock.
The farmer observed a survivor (the rabbit that died) and based his strategy on that single data point, ignoring all the rabbits that didn’t run into stumps.
The Logic of the Stump
The rabbit’s death was real. The farmer saw it with his own eyes. But it was a rare, unrepeatable event—a “black swan” of rabbit behavior. By focusing on this survivor (the dead rabbit), the farmer ignored:
- The thousands of rabbits that avoided stumps
- The structural impossibility of repeating the event
- The opportunity cost of not farming
Survivorship bias is building a life around the stump, waiting for lightning to strike twice.
Historical Manifestations
- The Examination Miracle: Stories of scholars who passed the imperial exams after studying by candlelight led generations to copy this behavior, ignoring the thousands who studied similarly and failed.
- Business Success Stories: Biographies of wealthy merchants emphasized their virtues, ignoring the countless virtuous merchants who failed due to circumstance.
- Military Heroes: Celebrating generals who won against odds, encouraging future generals to take similar risks without accounting for the many who tried and died.
Legalist Interpretation
Han Feizi, who recorded this parable, was a Legalist—believing in systems over virtue, statistics over stories. He would have told the farmer: “Your sample size is one. Base policy on aggregate data, not anecdotes.”
The Legalist approach to survivorship bias: build systems that don’t depend on rabbits running into stumps.
Modern Applications
Survivorship bias appears in:
- Startup culture celebrating unicorns while ignoring thousands of failed ventures
- Investment advice from those who got rich, ignoring those who followed the same advice and lost
- Academic research publishing positive results while file-drawering negative ones
- Military armor placement based on where returning planes were hit (Wald’s insight: armor where the survivors weren’t hit)
Each is waiting by the stump, ignoring the fallen.
The Lesson
The farmer at the stump teaches that visible success is the exception, not the rule. The wise person:
- Asks: “What happened to those who tried and failed?”
- Recognizes that survivors often survived by luck, not skill
- Builds systems that work without requiring miracles
正如韩非子所言：“今欲以先王之政治当世之民，皆守株之类也。” (Those who would govern today with the policies of ancient kings are all like the man guarding the stump.)
Don’t wait for rabbits. Plow your fields.