# What is the sunk cost fallacy, and how does it keep you stuck? Canonical: https://zestasy.com/wiki/sunk-cost-fallacy/ Section: Zestasy Wiki > Mindset · Updated: 2026-10-14 · Publisher: Zestasy *Zestasy Wiki: our reference answers. Checked for facts and sources; less curated than the magazine.* The sunk cost fallacy is letting money, time or effort you have already spent, and cannot get back, decide what you do next. It keeps you finishing the bad film, renewing the unused membership and pushing on with the project you stopped believing in. The fix is to judge the next step only on what it will cost and give you from here. A sunk cost is a cost that has already been paid and cannot be recovered, and economists treat it as irrelevant to future decisions. The [sunk cost fallacy](https://en.wikipedia.org/wiki/Sunk_cost) is what happens when we treat it as relevant anyway: we keep going, not because the next step is worth it, but because stopping would make the earlier spending feel wasted. It is sometimes called the Concorde fallacy, after the supersonic jet that kept being funded long after its economic case had faded. The odd thing is that it feels like good character. Finishing what you start, not wasting money, seeing things through: these are virtues most of us were raised on. The fallacy borrows their clothes. ## What it looks like on an ordinary week - **The ticket.** It is raining, you are tired, the concert is across town, and you would honestly prefer soup and an early night. But you paid for the ticket, so off you go, damp and resentful. - **The membership.** The gym, the streaming service, the language course you stopped opening in March. You keep paying because cancelling feels like admitting the original decision was a mistake. - **The book.** Two hundred pages in and you dread picking it up. You carry on because two hundred pages is a lot to throw away. (We have a whole page on [stopping a book halfway](https://zestasy.com/wiki/stopping-a-book-halfway/), and it is more permissive than your school was.) - **The restaurant plate.** Full, but it was expensive, so every bite gets eaten. The money is gone either way; only your evening is still in play. - **The project.** The renovation, the side business, the plan for the garden. Months in, the reasons for doing it have changed, but the months themselves have become the reason. ## Why it grips so hard Part of it is that stopping turns a vague cost into a clear loss. While you are still going, the money and effort are an "investment". The moment you stop, they become a waste, and you have to look at it. Part of it is other people: quitting can feel like a public verdict on your judgement. And part of it is simply momentum. Carrying on requires no decision. Stopping requires one. None of this makes you foolish. It makes you human, with a strong dislike of waste, which is mostly a useful trait in the wrong place. ## Questions that break the spell When you notice the phrase "but I've already...", stop and run through these: - **If I were starting fresh today, with nothing spent, would I choose this?** If the answer is no, the past spending is the only thing holding you in. - **What does the next hour, month or payment get me?** Look forward only. The money already spent is the same whether you continue or not. - **What would I tell a friend?** We are excellent at spotting other people's sunk costs. Borrow that clarity. - **What else could this time go to?** Carrying on always has a cost too: the evening, the weekend, the attention you could give to something you actually want. - **Is there a smaller version?** Sometimes the answer is not quit or continue but shrink: one more chapter to see if it turns, a cheaper tier of the membership, half the garden. ## When carrying on is right Not every "keep going" is a fallacy. Plenty of good things are tedious in the middle: learning an instrument, training for a long walk, the third week of a new job. The test is not whether it feels hard but whether the reasons to continue are about the future. "This will be worth it when I can play the piece" is a future reason. "I've already bought the piano" is not, on its own. For the harder version of this decision, see our page on [knowing when to quit](https://zestasy.com/wiki/knowing-when-to-quit/). ## FAQ ### Is the sunk cost fallacy the same as being stubborn? Not quite. Stubbornness is refusing to change course in general. The sunk cost fallacy is specifically about letting past, unrecoverable spending steer the decision. A stubborn person might also be in its grip, but a very flexible person can fall for it too, usually over something they paid a lot for. ### Does it only apply to money? No. Time and effort count just as much, and they are often stickier, because you cannot ask for a refund on three years of evenings. Relationships, careers and hobbies all collect sunk costs. ### How do you stop feeling guilty about the money you've lost? Remind yourself that the money was lost the moment it was spent, not the moment you stopped. Quitting does not create the loss; it just stops it growing. Some people find it helps to think of the spending as the price of finding out. ### Can you avoid it altogether? Probably not entirely, but you can make it rarer. Build in small check-ins on long commitments, a moment every few months to ask whether you would sign up again today. It is much easier to stop at a planned checkpoint than in the middle of a bad evening. ## Sources - [Wikipedia: Sunk cost](https://en.wikipedia.org/wiki/Sunk_cost) ## Related - [How do you know when to quit something?](https://zestasy.com/wiki/knowing-when-to-quit/) - [Is it OK to change your mind?](https://zestasy.com/wiki/changing-your-mind/) - [What do you do when a plan goes wrong halfway through?](https://zestasy.com/wiki/handling-setbacks-midway/) - [Is it OK to stop reading a book halfway through?](https://zestasy.com/wiki/stopping-a-book-halfway/) - [How do you stop overthinking small decisions?](https://zestasy.com/wiki/overthinking-small-decisions/) - [All Mindset answers in the Wiki](https://zestasy.com/wiki/#mindset)