You entered a position with a clear thesis. The thesis has since stopped being true. The position is underwater. And yet you are still holding — not because the forward case is compelling, but because of how much you have already lost, how many hours you spent researching it, or how publicly you argued for it. That is not a risk assessment. That is a sunk-cost trap. This article breaks apart the mechanism, names its three flavors, and teaches the single question — the open-fresh test — that cuts through it every time.

What a Sunk Cost Actually Is

A sunk cost is any resource — money, time, or conviction — that has already been spent and cannot be recovered regardless of what you do next. The key phrase is regardless of what you do next. Whatever you paid to enter a position, whatever hours you spent building the research case, whatever credibility you staked on a public call: all of it is gone the moment it was spent. Holding longer does not recover it. Exiting does not destroy it further. It is simply gone.

This sounds obvious stated flatly. It is almost never experienced that way. The human brain is not built to treat past spending as irrelevant. It treats past spending as an investment — something that should yield a return. The larger the spend, the more it feels like the position owes you something. That feeling is the trap, and it is completely decoupled from whether the position will actually move in your favor.

Escalation of Commitment: Why the Brain Keeps Going

Decision science calls this pattern escalation of commitment. Once a person has committed resources to a course of action, the psychological pressure to continue that course increases — not because the expected outcome improves, but because stopping means admitting that the prior spending produced nothing. The brain reframes continued holding as "giving the trade more time" rather than "adding opportunity cost to an already-spent sum."

The escalation is self-reinforcing. The deeper the loss on an open position, the more uncomfortable exit becomes — because exit forces a concrete acknowledgment of what was lost. Holding preserves a kind of ambiguity: the position is down, but it has not been closed, so the loss is not yet "real." This is behavioral accounting, and it is exactly backward from rational accounting. In rational accounting, a position that is down 30 units is down 30 units whether it is open or closed. The ledger does not care about your feelings toward the entry.

Three Flavors of Sunk Cost in Open Positions

The sunk-cost trap in trading arrives in three distinct forms. Each one produces the same result — holding a position for the wrong reason — but each requires slightly different awareness to catch:

Monetary sunk cost. "I'm already down 40 units on this. I can't close it now." The entry price has become an anchor. The mind treats the distance between entry and current price as a debt the market owes. But the market does not know your entry price and is under no obligation to revisit it. The relevant question is not where the price came from but where it is likely to go.
Research-time sunk cost. "I spent three days building this thesis. If I exit, all that work was wasted." The hours of research are gone either way. A well-researched thesis that has since been invalidated by new information is not a reason to hold — it is a reason to update. Exiting does not destroy the analytical work; it applies it correctly.
Public-conviction sunk cost. "I told everyone this was the trade. I can't exit in front of them." This is the most insidious form because it introduces a social audience into a private decision. The position is now being held partly to manage ego rather than to manage risk. The market has no awareness of your public commitments, and it will not respect them. Closing a position that has moved against your thesis is not a loss of credibility — it is evidence that you can update on evidence. Refusing to close it to avoid embarrassment is the actual credibility problem.

The Forward Question: Would You Open This Now?

Every open position should be able to pass a single test: If I had no position right now — no history, no entry price, no prior research, no public statement — would I open this position today, at this price, with this thesis?

This is the open-fresh test. It strips away every sunk cost and forces a pure forward assessment. If the honest answer is yes — the thesis is intact, the setup is still valid on its own merits, the expected outcome still justifies the risk — then holding is a reasoned choice. If the honest answer is no — the thesis has broken, the original conditions are gone, you are only holding because of what has already been spent — then you are holding a position you would not choose to open. That is the exact definition of letting a sunk cost drive a decision.

The test works because it creates a clean separation between past spending (irrelevant) and forward expectation (the only thing that matters). It does not require certainty about outcomes. It requires only that you assess the position on its own merits rather than on what it has cost you so far.

Averaging Down: Sunk-Cost Reasoning in Disguise

Averaging down — adding to a losing position to reduce the average entry cost — is often presented as a strategy. In some systematic frameworks, with predefined rules and a thesis that has not changed, it can be part of a disciplined approach. But in practice, most averaging down is sunk-cost reasoning dressed up as method.

The logic usually sounds like this: "The position is down, so the price is better now than when I entered. I'll add here to lower my average." But this reasoning smuggles in the original entry as the reference point. The question is not whether the price is better than your entry. The question is whether this is a compelling new position on its own merits, right now, with no reference to where you are already positioned. If you apply the open-fresh test and the answer is yes — the thesis is intact, the risk is defined, the setup is valid independently — then adding may be defensible. If you apply the test and the real answer is that you are adding because you want a smaller average to make the eventual exit feel less painful, that is sunk-cost averaging. It increases your exposure to a broken thesis.

A broken thesis is not the same as a temporarily adverse move. The distinction matters. If the original conditions are still present and the price has simply moved against you temporarily, that is a different situation than one where the conditions that justified the position have changed. Sunk-cost averaging conflates the two and adds risk at exactly the moment when the case for doing so is weakest.

What This Costs

The direct cost is straightforward: positions held for sunk-cost reasons tend to accumulate losses beyond what the original risk plan intended. Because the normal exit signal — the thesis being wrong — has been overridden by the sunk-cost feeling, the position stays open through damage that a clean process would have stopped earlier.

The indirect cost is larger. Every unit of capital tied up in a position held for the wrong reason is capital that cannot be deployed toward a position with a genuine forward case. The opportunity cost compounds with time. And the longer the pattern persists, the more normalized it becomes — each sunk-cost hold makes the next one feel more like reasonable patience and less like a behavioral failure.

There is also a process cost. A trader who allows sunk costs to drive hold decisions will find that post-trade review becomes systematically distorted — because the reasoning recorded for the hold will be post-hoc rationalization rather than the actual driver, which was the spent resources. The feedback loop that should correct the behavior gets noise injected into it instead.

The Discipline: The Open-Fresh Practice

The open-fresh test is most useful as a scheduled practice rather than a reactive one. Waiting until you feel the pull of a sunk cost to apply it is waiting too long. Instead, build it into a standing review rhythm for every open position you carry.

At each review, ask the question plainly: Would I open this position right now, from scratch, at the current price? Write the answer down with a single sentence of reasoning. That sentence becomes your forward thesis. If you cannot write one — if the only justification you can produce references what you have already spent rather than what you expect going forward — that absence is diagnostic. It tells you what is actually driving the hold.

Two clarifications on what this discipline is not. It is not a mandate to exit every losing position immediately — some drawdowns are within the original risk plan, and a position can be down without the thesis being broken. And it is not a solution to the separate problem of loss aversion, which is covered in its own article. The open-fresh test is specifically targeted at the sunk-cost mechanism: the irrelevant weight of prior spending distorting a forward assessment. It does not solve for every reason a position might be held incorrectly.

Historical Example: Barings Bank, 1992–1995

Nick Leeson was a derivatives trader at Barings Bank — one of Britain's oldest merchant banks — who began concealing trading losses inside a hidden error account numbered 88888 starting in 1992. Each time his Nikkei futures positions moved further against him, he doubled down rather than exit, driven by the compounding weight of losses already spent: closing would have made the prior spending undeniably real. The pattern is a textbook escalation of commitment — the larger the hidden deficit grew, the more psychologically costly exit became, and so each new bet was framed internally as the one that would recover what had already been lost. By the time the positions collapsed on 26 February 1995, the concealed losses had grown from roughly £2 million to £827 million (roughly $1.4 billion, approximate) — more than twice the bank's available trading capital — rendering the 233-year-old institution insolvent. No single decision caused this outcome; the mechanism was the unbroken chain of hold-and-double decisions, each one anchored to sunk costs that had ceased to be relevant to any forward assessment.

Simulator Exercise: The Open-Fresh Speed Run

Open Abu Terminal and start a Speed Run in any mode. Let it run normally for the first several events. Then, at three different moments where you are holding a position that has moved against you, pause before making any hold or exit decision and write down — in a note or a scratch pad outside the simulator — your answer to the open-fresh question: Would I open this position right now, with no history?

Grade each answer as yes or no, and write one sentence of reasoning. Then make your decision. After the run, compare your grades and your actual decisions. The question to examine is whether any of your hold decisions were driven by yes-forward-case reasoning or by not-wanting-to-realize-a-loss reasoning. The simulator gives you a controlled environment in which to feel the specific pressure of a losing open position and practice the discipline of separating it from a forward assessment. The dollar amounts in simulation are not real, but the cognitive pattern you are training is exactly the one that operates under real conditions.

Run this exercise across multiple sessions and log the pattern. If you consistently grade "no" on the open-fresh question but still hold, you have identified a real behavioral gap — not a knowledge gap. The fix is not more research. It is more repetitions of the test until the habit of applying it becomes automatic before the sunk-cost feeling has time to solidify into a rationalization.

Limits: What This Is Not

Applying the open-fresh test will sometimes correctly produce a hold decision. A position that is down but whose thesis is fully intact, whose risk plan has not been violated, and which you would genuinely open fresh at the current price is a position you can hold on principled grounds. The test is not an argument against patience or against riding out drawdowns within a defined risk plan. It is an argument against the specific and common error of holding because of what has already been spent.

This article also does not address position sizing, stop-loss mechanics, or the rules for when to exit based on technical conditions — those are covered in Risk Management and Dynamic Position Sizing. The open-fresh framework is one tool for one specific cognitive error. Use it in combination with a defined risk plan, not as a substitute for one.

Educational simulator content, not financial advice.

Sunk-Cost Trap in Open Positions: Stop Throwing Good Risk After Bad