You bought a ticket months ago. Tonight you are tired, the event no longer appeals and getting there will take another hour. “But I have already paid” feels like a decisive argument, even though attending cannot return the ticket money.
This is a useful setting for noticing sunk-cost thinking: an unrecoverable past cost starts driving a choice about the future. Recognising it does not automatically tell you to leave, cancel or give up. It tells you which part of the reasoning deserves another look.
Separate the two columns
In one column, put costs that cannot now be recovered. In another, put the consequences that still depend on your choice: travel time, additional spending, enjoyment, obligations to other people and any genuine cancellation costs.
The Decision Lab’s explanation of the sunk-cost fallacy describes how earlier investment can encourage continued commitment. The practical exercise here is to make the remaining choice visible rather than treating the past as something the next action can undo.
Ask: if I faced these remaining options today without the earlier payment, which would I prefer? Then add back any real commitments that the simplified question leaves out. A friend relying on you or a contractual obligation is a future consequence, not merely an emotional attachment to the receipt.
Do not turn the idea into another rigid rule
Persistence can still be worthwhile. A course may become more useful after a difficult introductory section; a project may have credible benefits ahead. The relevant evidence is the expected value of continuing, not the mere fact that you have already invested heavily.
- What cannot be changed now?
- What additional cost does continuing create?
- What benefit is realistically still available?
- What new evidence would change the decision?
For recurring commitments, choose a review point in advance. That can make reassessment feel like a normal part of the plan rather than a personal admission of failure. Keep the review specific enough that you can act on it.
One unhelpful purchase does not need to become an entire evening of additional effort. Equally, one frustrating evening does not prove that every long-term commitment should end. Separating the past from the remaining choice makes room for a more honest decision about what comes next.