Imagine that you owe me $100.
I offer you a choice. You can pay me that $100 and settle the debt, or we can flip a coin:
Heads, and I erase the debt entirely.
Tails, and you owe me $200.
The math is identical. Paying me now produces a guaranteed loss of $100. Taking the bet produces an average loss of $100: half the time you lose nothing, and half the time you lose $200.
Yet the two choices do not feel identical.
The certain loss feels final. The gamble, however dangerous, leaves open the possibility of escape. With one favorable flip, the entire problem disappears.
That possibility can be hard to resist.
This is the other face of loss aversion. If you remember from our previous article, when we offer a flip of the coin where you can win $15 and only lose $10 – most people refuse. This is the opposite – it is a 50/50 bet, and most people take it. The fear of losing can stop us from taking a risk when things are going well. But once we believe we are already losing, that same fear can push us toward greater risk.
While loss aversion can stop us from starting. The fear of a sure loss can stop us from stopping.
In prospect theory, Daniel Kahneman and Amos Tversky found that people tend to evaluate decisions differently depending on whether they see themselves as facing gains or losses.
In the domain of gains, people commonly become cautious: they prefer a smaller certain reward to a gamble with the same or even greater expected value.
In the domain of losses, that preference can reverse. Faced with a certain loss, people may accept a risky alternative that offers some chance of avoiding the loss altogether. Kahneman and Tversky called this pattern the reflection effect.
“Sure loss” is a useful way of describing the moment when this reversal becomes psychologically powerful. The loss may already exist on paper, but it has not yet been accepted. Selling the investment, ending the project, leaving the job, or walking away from the relationship would make it official.
Until then, there is still hope.
Suppose you bought a stock for $50 and its price has fallen to $40. You have lost $10 in economic value, but the loss can still feel temporary. The stock might recover. Selling at $40 closes the door on that possibility and converts the paper loss into a realized one.
This is why investors often sell profitable investments too quickly while holding losing investments too long - a pattern known as the disposition effect. Shefrin and Statman first placed this behavior within a broader framework involving prospect theory, regret, mental accounting, and self-control. Terrance Odean later examined the trading records of 10,000 brokerage accounts and found that investors demonstrated a strong preference for realizing gains rather than losses.
Sometimes holding is rational. The investment may still have strong prospects, selling may create tax consequences, or transaction costs may matter. But often the original purchase price has become an emotional reference point. The decision is no longer based on the question, “What is the best place for this money today?” It is based on a different question: “How can I avoid admitting that I lost?”
The sure-loss trap extends far beyond investing. For example:
A team continues funding a strategy that has missed every meaningful target because canceling it would force everyone to acknowledge that the original plan was wrong.
A person remains in an unhealthy job because leaving would mean that the years invested there did not produce the future they expected.
Someone stays in a relationship long after trust has disappeared because ending it would make the loss undeniable.
As long as we continue, we can tell ourselves that the situation is still unfolding. The investment may rebound. The strategy may finally work. The relationship may return to what it was. The job may improve after the next reorganization.
Walking away closes that mental account.
This overlaps with the sunk-cost effect: our tendency to continue an endeavor because we have already invested money, time, effort, or identity in it. Hal Arkes and Catherine Blumer found that prior investments can increase people’s willingness to continue, even when those investments should not determine the next decision.
The sunk cost says, “I have already put too much into this to stop.”
The sure loss says, “If I stop now, I will have to accept that what I put into it is gone.”
Together, they can be extraordinarily powerful. They turn quitting into evidence of failure and persistence into evidence of courage—even when persistence is making the situation worse.
Once we see ourselves as being “down,” our goal can quietly change.
At the beginning of a decision, we may have been trying to build a successful business, develop a good relationship, make a sound investment, or improve our health. After losses accumulate, the goal can shift from achieving a positive outcome to getting back to zero.
This is why gamblers chase losses. The person who began the evening hoping to have fun or win a little money may eventually become focused on recovering what has already been lost. Riskier bets begin to feel justified because a modest gain is no longer enough. Only a large win can erase the deficit.
The same pattern appears in organizations. A project begins with clear strategic goals, but after several setbacks its purpose becomes survival. More money is committed, deadlines are extended, and warning signs are reinterpreted as temporary obstacles. Leaders may believe they are protecting the original investment when they are actually increasing the eventual loss.
Research on prospect theory does not suggest that everyone becomes risk seeking whenever they face a loss though. Context, experience, probabilities, and the way a decision is framed all matter. Even so, the broad pattern is important: people who would normally reject a gamble may accept it when the alternative feels like certain defeat.
The best defense against the sure-loss trap is to separate the future decision from the emotional weight of the past.
Would you buy this investment at its current price?
Would you approve this project with its current costs, evidence, and likelihood of success?
Would you accept this job as it currently exists?
Would you begin this relationship under its present conditions?
This question does not erase what has already happened, but it changes the reference point. Instead of trying to recover the past, you evaluate the options available from this moment forward.
Investors use stop-loss rules.
Organizations can define the evidence that would trigger a project review or cancellation.
Individuals can decide how long they will test a new approach and what improvement they need to see before investing more.
These rules are imperfect, and they should not replace judgment. Their value is that they are created before the desire to avoid a sure loss begins distorting that judgment.
When we are focused on recovering what has been lost, we often treat additional time, money, health, or emotional energy as the price of getting back to even. But those resources are not free simply because we have already begun.
They are new bets.
Loss aversion has two faces.
Before we act, it warns us about what could go wrong. It can make us cautious, incremental, and unwilling to pursue opportunities with meaningful upside.
After things go wrong, it changes its message. Now it tells us to keep going, take another chance, and avoid making the loss final.
The first voice says, “Do not risk losing.”
The second says, “Do whatever it takes not to admit that you already have.”
Neither voice is always wrong. Some struggling investments recover, some difficult periods in careers and relationships are worth working through, and some projects succeed because people persisted after others would have quit.
The challenge is distinguishing intelligent persistence from a desperate attempt to escape a sure loss.
When you feel the urge to double down, ask one question: Am I taking this risk because the future opportunity is genuinely attractive or because I cannot bear to close the door on the past?
Sometimes courage means continuing through uncertainty.
Sometimes it means accepting the loss before it grows.
A weekly reminder to rethink, reflect, and act:
Where in your life are you holding on simply because letting go would make the loss feel real?
Go deeper into this week’s topic:
Curated ideas to inspire reflection:
Every week in Behavior Shift Weekly, we share ideas grounded in behavioral science and psychology, practical tools to help you think differently, act intentionally, and build the life you actually want.
Arkes, H. R., & Blumer, C. (1985). The psychology of sunk cost. Organizational Behavior and Human Decision Processes, 35(1), 124–140.
Kahneman, D., & Tversky, A. (1979). Prospect theory: An analysis of decision under risk. Econometrica, 47(2), 263–291.
Odean, T. (1998). Are investors reluctant to realize their losses? The Journal of Finance, 53(5), 1775–1798.
Shefrin, H., & Statman, M. (1985). The disposition to sell winners too early and ride losers too long: Theory and evidence. The Journal of Finance, 40(3), 777–790.
Tversky, A., & Kahneman, D. (1992). Advances in prospect theory: Cumulative representation of uncertainty. Journal of Risk and Uncertainty, 5, 297–323.
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