You buy a movie ticket, but halfway through the film, you realize it’s terrible. Should you stay or leave? If you think, “I’ve already paid for it—it’d be a waste to leave,” you’ve just fallen into the sunk-cost trap.
Concise Definition
Sunk costs are expenses that have already been incurred and cannot be recovered, no matter what you do next. Rationally speaking, they should be completely irrelevant when weighing your options—the only question is which option will yield better results from this point forward.
The ticket money is lost either way. So the real choice is simply this: spend another hour on a bad movie, or use that hour to do something else.
It's more expensive than you think
- The software project has consumed two years of effort but is on the wrong track; it continues simply because "it would be a waste to give up"
- Stocks are taking heavy losses, yet I keep holding them in hopes of a recovery instead of reassessing their actual prospects
- An unfinished degree in a field I’ve lost interest in
- A relationship maintained based on the number of years invested, rather than its current state
Why Is It Hard to Escape?
Giving up is tantamount to admitting that a previous decision was wrong. The more you invest, the more painful that admission becomes, so people invest even more to postpone that feeling—and the cycle tightens its grip.
An effective self-reflection question: If I were just learning about this project today and hadn’t spent a single dong on it yet, would I start it? If not, then the only reason you’re continuing is sunk costs.
Dealing with Reality
Set your stopping conditions right from the start, while you’re still in your right mind: how much money, how much time, or if you don’t reach a certain milestone, stop. Setting these limits in advance protects you from your future self six months from now.
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