A past windfall can make a +3% gain feel too small to keep and a -7% loss feel too painful to close. That comparison can push traders to lock in modest winners early while holding losers past the point their original risk plan allowed.
At 10:42 on a rainy Thursday, Luca sat at his kitchen table in Milan with coffee gone cold beside his keyboard. His account showed two open positions. One was green by 3%. The other was down 7%.
The green position had reached the first level Luca had marked before entry. He sold it within seconds. The red position had already crossed the stop he had written in his journal, but he dragged the stop lower instead.
One number kept returning to him: +24%. Three weeks earlier, one unusually strong trade had closed at that gain. A 3% winner now looked disappointing beside it. A 7% loser looked temporary, because closing it would make the contrast permanent.
By the close, the winner was gone and the loser was still open. The next move could turn it around. It could also deepen the loss and take capital intended for the following week’s trades. Luca no longer had a decision tied to the setup. He had a decision tied to a memory.
This is an illustrative composite, but the pattern is familiar: a standout past outcome becomes an anchor for the next trade.
Educational content, not financial advice.
One exceptional trade can reset the wrong benchmark
A large gain changes the reference point a trader carries into the next decision. Instead of asking, “Has this trade reached my target?” the question quietly becomes, “Could this become another 24% move?”
That is a much harder standard for a planned winner to meet.
The same anchor can distort a loss. A trader who has recovered from a painful drawdown before may begin treating every losing position as a recovery story. The trade’s current price, invalidation level, position size, and total account exposure fade behind the memory of the time waiting worked.
Transaction-level research involving 189,530 retail investors found that prior large gains and losses can asymmetrically reshape the disposition effect: the tendency to sell winners and retain losers. The point is not that every early exit or delayed exit is wrong. Market conditions change. A planned target can be reached, and a stop can require review when new information materially changes the trade thesis.
The problem starts when a past outlier replaces the rule that was meant to govern the current trade.
A percentage gain and a percentage loss ask different questions
A +3% gain and a -7% loss may look like two percentages on the same screen, but they call for separate checks.
For the winner, the useful question is whether the original plan called for profit-taking at this level, a trailing exit, or continued exposure. If the trade reached a planned target, taking profit can be disciplined. If the trader exits only because the gain feels fragile after an earlier big winner, the decision may be driven by fear of giving back a small win.
For the loser, the question is more direct: what condition made the original trade valid, and does that condition still hold? If the invalidation level has been reached, keeping the position needs a documented reason that existed before the loss, not a hope created by it.
A stop is not a prediction that the market cannot recover. It is a boundary on how much of the account one trade may consume if the setup is wrong. Slippage can make a stop fill below the intended level, as explored in What Happens When a $100 Stop Fills at $94?. That possibility makes position sizing and planned exits more important, not less.
Put the comparison back where it belongs
Luca’s 24% winner belonged in his journal as evidence of one outcome under one set of conditions. It did not belong in the exit rule for two unrelated positions.
A practical review can separate the memory of a prior trade from the facts of the current one:
- Record the entry reason, target, invalidation level, and maximum planned loss before placing the order.
- At each decision point, compare the current position with that written plan, not with the account’s best recent trade.
- Review winners and losers together at the end of the week. Look for repeated early profit-taking and repeated stop extensions.
- Measure drawdown in account terms, not only in the percentage attached to one position.
Approval-gated trading can create a useful pause here. When an AI-generated signal is queued for review, the trader can inspect size, risk, and the reason for the trade before approving it. The final decision stays with the human. That pause cannot remove uncertainty, but it can make an emotional exception easier to spot before an order is placed or changed.
The next morning needs a rule, not a rescue story
The following morning, Luca reopened his journal before opening the chart. He wrote down the original stop he had ignored, the reason he had sold the +3% winner, and the +24% trade that had been sitting in the back of his mind.
The entry was plain: “Compared both positions to an old outcome instead of their own plans.”
For the next trade, he set a target and an invalidation level before the order. If either level was reached, he would record the decision before changing it. That did not guarantee a better result. It gave him a process he could examine after the trade, including during a losing stretch.
A trading journal becomes more valuable when it shows where the plan changed and why. That is how a trader can distinguish a revised thesis from an exception made to avoid regret. For a deeper look at protecting risk limits during a loss, see Maximum drawdown: What Seven Losses Taught Daniel About Position Sizing.
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