Too Far to Turn Back? The Trap of Sunk Costs

A specific kind of decision gets harder the longer we stay with it.

You know the course you chose is no longer serving you. The relationship has become exhausting. The friendship no longer feels right to continue. Yet, instead of asking whether you still want any of these things, your mind returns to a different question: But after everything I’ve already put into this, how can I just walk away?

Sometimes, the hardest part of letting go is not losing what we have but accepting how much we have already invested. This is where the sunk cost fallacy enters the picture.

When the past starts making today’s decision

A sunk cost is something we have already spent, like money, time, effort, or emotional energy, that cannot be recovered. Rationally, once something is gone, it should not determine what we do next. The useful question is supposed to be what the available options look like from this point forward.

Psychologically, however, the past does not disappear so neatly.

Research by Hal Arkes and Catherine Blumer demonstrated the sunk cost effect: people become more likely to continue an endeavour after investing resources in it. In one of their studies, people who had paid more for theatre subscriptions attended more performances, suggesting that a larger previous investment made continuing feel more worthwhile. Participants who had already invested in a project also tended to judge its chances of success more favourably. 

The reasoning often sounds perfectly sensible: I have already come this far. I cannot stop now.

But something in the sentence quietly changes the question. Instead of asking, “Is this still worth continuing?”, we start asking, “How can I make what I already spent worth it?” And those are not the same question.

The discomfort of admitting a loss

Part of the problem is that losses do not feel psychologically neutral.

Daniel Kahneman and Amos Tversky’s Prospect Theory showed that people generally feel the pain of losing more strongly than the pleasure of gaining the same amount. Losing ₹100, for instance, can feel more significant than gaining ₹100 feels rewarding.

That helps explain why walking away can feel worse than continuing, even when continuing is objectively costing us more. Imagine paying for an expensive course and realising two months in that it is nothing like what you expected. Leaving means accepting that the money is gone.

Continuing gives you the comforting possibility that, eventually, the investment will somehow become worthwhile. The problem is that the money is gone either way. Yet emotionally, continuing can feel like recovering the loss.

This is one reason sunk costs can be so powerful: they turn an old loss into an argument for a new investment.

When changing your mind feels like admitting you were wrong

There is another layer to this.

We do not simply make decisions; we also build stories around them. We tell ourselves why we chose a particular college, accepted a particular job, stayed in a particular friendship, or invested in a particular project. When new evidence suggests that the decision may have been wrong, it creates an uncomfortable gap between what we believed then and what we see now.

This is closely related to what psychology calls cognitive dissonance, the discomfort that can arise when our beliefs, choices and actions do not fit comfortably together. Festinger’s original theory proposed that people are motivated to reduce this psychological inconsistency. 

So instead of thinking, “I made a decision that no longer makes sense,” we may unconsciously search for reasons that make the decision still feel justified.

It will get better.

I just need to try a little harder.

I have already given it so much.

The mind is not necessarily trying to delude us. It is trying to make our past and present feel coherent.

From commitment to escalation

Sometimes this goes further. A person does not simply continue; they increase their commitment.

This is known as the escalation of commitment. Barry Staw explained how people can continue putting time, effort, or money into a decision even when things are not going well. When we have already invested a lot, giving up can feel like admitting that our earlier decision was wrong. So instead, we keep trying, hoping that the next effort will finally make everything feel worth it.

Think about a project that has already consumed months of work. The first setback might lead to another round of effort. Then another. Soon, the question is no longer whether the project deserves more resources. It becomes about proving that all those earlier hours were not wasted.

The same pattern can appear outside workplaces.

A friendship that has required years of emotional effort can become difficult to leave. A career that took years of education can feel impossible to reconsider. A relationship can become something we keep repairing partly because ending it would force us to confront how much we hoped it would become.

The investment begins to feel like evidence that we should stay.

But what exactly are we trying to save?

Perhaps the most interesting part of sunk costs is that we sometimes become more attached to justifying the investment than to the thing itself.

A person may no longer enjoy the degree they chose, but leaving feels like throwing away years of study. Someone may no longer want the expensive purchase, but using it feels necessary because otherwise the money “went to waste.” 

But an investment does not become meaningless simply because it does not produce the outcome we wanted. The degree may have given you knowledge. The relationship may have changed you. The failed purchase may have taught you what you actually value.

An outcome can be disappointing without making the experience worthless. That distinction matters.

Looking forward instead of looking backward

Breaking the sunk-cost cycle does not mean becoming careless or quitting everything the moment it becomes difficult. Persistence can be valuable. Some worthwhile things require patience, discomfort and repeated effort.

The difference is why we are continuing. A useful question is:

“If I had not already invested anything in this, would I choose it today?”

Not, “How much have I already spent?”

Not, “How embarrassing would it be to quit now?”

Not, “What will everyone think after everything I have done?”

But simply: Knowing what I know today, would I choose this again?

That question moves attention away from the irreversible past and towards the future, which is the only part of the decision we can still influence.

Walking away is not always losing

We often imagine that leaving means admitting defeat. That staying proves strength, loyalty or perseverance, while walking away means everything before it was a mistake. But sometimes continuing is not perseverance. It is simply refusing to accept that the original decision has changed.

The past deserves to be acknowledged, but it does not always deserve a vote. What we have already spent is gone. What remains is our time, attention, energy and choices from here.

Because the real trap of a sunk cost is not that you have come too far to turn back. It is that you keep moving forward just because turning back feels like admitting you should have stopped sooner.

You cannot recover the past by sacrificing more of the future.