You haven’t opened that app in three days.
Not because you forgot. Because you are afraid to.
The last time you checked, your return sat at -47%. You know it is still falling. But as long as you don’t look, that number isn’t “real” yet.
You think you are just being avoidant. In reality, your brain is executing a program hardcoded into human genetics.
This program has a name.
In 1979, Daniel Kahneman and Amos Tversky published a paper that would eventually rewire the foundations of economics: Prospect Theory. Its core finding boils down to a single sentence:
The pain of losing is approximately 2.5 times greater than the joy of gaining the same amount.
The thrill of making $10,000 does not cancel out the agony of losing $10,000.
This is not a flaw in your mindset; it is your factory setting. Evolution engineered us to be hyper-sensitive to loss because, in our ancestral environment, a loss often meant death.
In investing, this survival instinct becomes a lethal trap.
Prospect Theory predicts two behavioral responses. You have likely fallen prey to at least one.
The first: Holding on. “As long as I don’t sell, it’s not a real loss.” You draw a hard line between paper losses and realized losses—acting as if the capital is still intact as long as you don’t cash out. This is the “Disposition Effect”: the human tendency to lock in early profits while holding onto losing positions indefinitely.
The second: Panic selling. “If I don’t get out now, I’ll lose everything.” You liquidate at the absolute bottom because your brain has stopped processing analytical data; it is simply screaming, “Flee.”
The common denominator in both reactions:
Neither is based on today’s objective reality. Both are tethered to your original purchase price.
Your brain is using that initial price as an anchor. Every ounce of pain and every subsequent decision revolves around the desperate need to “break even.” But the market doesn’t know your buy-in price.
The market doesn’t care.
This is the anchor you refuse to cut.
It embedded itself into the exact number of your initial purchase, pinning you in place. If the asset rallies: “I haven’t broken even yet, it’s not enough.” If it tanks: “I’m doomed, the hole is just getting deeper.”
It is not the asset holding you hostage. It is the “historical price.”
As Annie Duke argues in Thinking in Bets, we must decouple decisions from outcomes.
Your decision to buy this fund may or may not have been rational at the time. Regardless, that decision is in the past.
The real question is no longer “Should I have bought this?” but rather, “Given the shares I hold today, what is my optimal move?”
These two questions seem similar, but psychologically, they are worlds apart.
The former traps you in a cycle of regret. The latter is a rigorous decision-making framework—one based on today’s data, today’s context, and today’s financial needs.
Try this mental exercise:
Sever the anchor, just for a moment.
Imagine you just received a cash deposit today, exactly equal to the current liquidated value of your portfolio. How would you deploy that capital?
Would you buy this exact same fund?
If the answer is “no”—then your only reason for holding it now is your refusal to accept the loss.
That is not an investment strategy. That is emotional accounting.
When you lose money, the true agony isn’t the shrinking balance.
It is the subsequent crisis of confidence in your own judgment. “Am I just bad at investing?” “How can I trust myself to make financial decisions going forward?”
These doubts are perfectly normal. But they are emotional reactions, not objective facts.
Kahneman spent his entire career championing one principle: decoupling the quality of a decision from the luck of the outcome. A mathematically sound decision does not guarantee a profitable result. A poor result does not retroactively make the decision flawed.
You took a loss. The very next decision you make, in the wake of that loss, is the true test of your decision-making rigor.
Open the app.
Look at the numbers. Make them “real.”
Then ask yourself the ultimate question: If this exact amount in cash were handed to me today, how would I deploy it?
That answer is the clarity you only achieve once the anchor is cut.
[ One Thought ] — Decision-making is a deliberate practice.
