亡羊补牢 (Wáng Yáng Bǔ Láo) — Mending the Pen After Sheep Are Lost
The Concept
English: Sunk Cost Fallacy — Continuing a venture or project because of previously invested resources (time, money, effort) rather than current value; throwing good money after bad.
Chinese: 亡羊补牢 (Wáng Yáng Bǔ Láo) — Mending the pen after sheep are lost.
Cultural Origin
This saying comes from the Strategies of the Warring States (战国策):
A shepherd had a pen with a hole in it. One night, a wolf entered through the hole and ate a sheep.
His neighbor advised: “You should mend the pen.”
The shepherd replied: “The sheep is already lost. Why bother?”
The next night, another wolf came and ate another sheep.
The shepherd finally mended the pen. No more sheep were lost.
The parable is often misinterpreted as “better late than never.” But the deeper lesson is about ignoring sunk costs (the lost sheep) to prevent future losses.
The Sheep as Sunk Cost
The sunk cost fallacy would be the shepherd refusing to mend the pen because he had already lost sheep—doubling down on the broken pen to “justify” the initial loss. Or worse, refusing to abandon a failed project because of how much was already invested.
The wise shepherd recognizes: the lost sheep are gone. The only question is whether to prevent future losses.
The Psychology of Loss
Why do we cling to sunk costs?
- Loss aversion — Losses feel worse than equivalent gains
- Commitment consistency — We want to appear consistent with past decisions
- Waste aversion — We hate admitting resources were wasted
- Identity — Abandoning a project feels like admitting failure
The shepherd who won’t mend the pen is protecting his ego, not his flock.
Historical Manifestations
- The First Emperor’s Construction Projects: Having invested massive resources in the Great Wall and his tomb, Qin Shi Huang doubled down on extraction, hastening his dynasty’s collapse.
- The Ming Dynasty’s Northern Expeditions: After early failures, the Yongle Emperor continued massive military campaigns to “justify” initial investments, draining the treasury.
- The Qing’s Resistance to Modernization: Having invested centuries in Confucian governance, the Qing clung to traditional systems long after they had become dysfunctional.
Legalist vs. Confucian Perspectives
Legalists like Han Feizi would approve of mending the pen—pragmatic response to current conditions, ignoring past losses. “世易时移，变法宜矣” (As times change, so should laws).
Confucians might hesitate, concerned that abandoning commitments undermines trust and social order. But even Confucius said: “过而能改，善莫大焉” (To err and then correct it is the greatest good).
Both traditions ultimately support mending the pen.
Modern Applications
The sunk cost fallacy appears in:
- Business where failing projects continue to receive funding
- Relationships where unhappy couples stay together because of “invested time”
- Investments where losing positions are held hoping to “break even”
- Wars where conflicts continue because of lives already lost
Each is refusing to mend the pen because sheep were already lost.
The Lesson
The shepherd teaches that past losses are irrelevant to future decisions. The wise person:
- Ignores sunk costs when evaluating future actions
- Asks only: “What is the best course now?”
- Recognizes that “wasting” more resources doesn’t justify past waste
正如战国策所言：“见兔而顾犬，未为晚也；亡羊而补牢，未为迟也。” (Seeing the rabbit, then calling the hound is not too late; losing the sheep, then mending the pen is not too delayed.)
The lost sheep are gone. Mend the pen for those who remain.