Mastering Decision-Making: Avoiding the Trap of Resulting

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  Published in Stocks and Investing on Tuesday, May 12th 2026 at 16:26 GMT by MarketWatch
      Locale: UNITED STATES

The Trap of "Resulting"

One of the primary hurdles in both gambling and investing is a phenomenon known as "resulting." This is the tendency to judge the quality of a decision based solely on its outcome rather than the logic and information available at the time the decision was made.

In a poker game, a player might make a mathematically sound move based on the odds, yet still lose the hand due to a stroke of bad luck. Conversely, a player could make a reckless, illogical bet and happen to win. A "resulting" mindset would incorrectly label the first move as a mistake and the second as a stroke of genius. In the stock market, this manifests when investors believe a stock was a "good buy" simply because it went up, or a "bad buy" because it went down, regardless of the underlying fundamentals or the risk profile at the time of purchase.

Breaking the Sunk Cost Fallacy

Investors often struggle to "fold" a losing position because of the sunk cost fallacy--the idea that because they have already invested a significant amount of money, they must continue to hold the asset to avoid "realizing" the loss. This mindset shifts the focus from the future potential of the asset to the past cost of the acquisition.

To counter this, Duke suggests a mental pivot: treating the current value of the asset as the starting point. The relevant question is not "How much did I pay for this?" but rather, "If I had this amount of cash today, would I buy this stock at its current price?"

If the answer is no, then holding the stock is a decision based on emotion rather than strategy. By framing the situation as a fresh investment decision, the investor can decouple their ego and their past losses from the current probabilistic value of the asset.

Probability vs. Certainty

Professional poker players operate in an environment of incomplete information. They do not seek certainty; instead, they seek a positive "expected value" (EV). This means making decisions that, if repeated a thousand times, would result in a profit, even if any single instance results in a loss.

Applying this to a portfolio means accepting that not every trade will be a winner. The goal is to ensure that the process used to make decisions is sound. When a stock drops, the investor must evaluate if the original thesis for the investment remains intact. If the fundamentals have changed, the probability of a recovery may have dropped significantly, making the "expected value" of holding the stock negative compared to moving that capital into a more promising asset.

Key Strategic Takeaways

• Avoid Resulting: Do not judge the quality of an investment decision based on the immediate outcome; focus instead on the process and the information available at the time.
• The Fresh Start Test: Ask yourself if you would buy the stock today at its current price. If the answer is no, the asset should likely be sold.
• Expected Value (EV): Shift the focus from avoiding a single loss to maximizing long-term gains through a repeatable, probabilistic process.
• Sunk Cost Detachment: Recognize that the purchase price is a historical fact that does not influence the future trajectory of the stock.
• Embrace Uncertainty: Acknowledge that luck plays a role in short-term outcomes, but a disciplined strategy mitigates risk over the long term.

By treating the stock market as a game of probabilities rather than a search for certainties, investors can reduce the emotional volatility associated with losses and make more rational decisions about when to hold and when to fold.