Sunk Cost Fallacy in Investing: Why Exit Rules Matter More Than Recovery Hopes

Investors often hold on to losing bets for reasons that have little to do with value. The pattern looks rational on a portfolio screen, yet it can be driven by pride and regret. A mountaineering story from Mt. Everest explains the risk. It also frames why exit rules matter, even when the recovery feels close.

On Everest, the "Death Zone" sits above 8,000 meters, where thin air impairs the body. In 1987, Ed Viesturs reached about 300 feet from the summit. Viesturs checked a watch at 2 PM, which was the preset turnaround time. Despite the summit being near, Viesturs turned back.

Viesturs later explained the choice with a line many investors repeat. "Getting to the top is optional." The return journey mattered more than the photo. The same logic appears in markets. There are no blizzards, yet judgement can blur. Emotions, ego, and the sunk cost fallacy can pressure investors to keep holding.

"The Sunk Cost Fallacy is a mental mistake that makes us stick with terrible choices, not because they still look good, but because we've already spent too much to change our minds," said Chakravarthy V., Cofounder & Executive Director, Prime Wealth Finserv. Chakravarthy V. said the bias appears often in investing decisions. The longer money stays committed, the harder it feels to reassess.

One common example starts with a simple stock purchase. You pay Rs 100 for a stock, and it drops to Rs 60. Logic suggests a fresh review of the business and price. Many minds instead focus on the Rs 40 gap. The next thought becomes a promise to wait. "I'll sell it when it goes back to Rs 100."

Item	Amount	What it often triggers
Buy price	Rs 100	Reference point that feels "right"
Current price	Rs 60	Pressure to "recover" losses
Gap	Rs 40	Urge to delay selling

Chakravarthy V. said the market does not remember an investor’s cost price. An investor does, and that memory can dominate decisions. "It's easy to forget that markets don't care. They don't know that you worked 60 hours a week to get that money. They don't care that you've owned a stock for a long time. The pricing merely shows what the market believes it's worth right now. That's all," stated Chakravarthy V.

This gap between market pricing and personal effort can lead to averaging down. Investors may justify holding with familiar words. "I've already put so much into this." At that stage, ego can replace process. The holding becomes a defence of an older decision. The focus shifts from expected returns to being proven right about the past.

Chakravarthy V. compared the behaviour to climbers who push on despite rising danger. "In finance, this is called "summit fever." Investors keep going, not because it's smart, but because going back seems like giving up. In fact, it's usually the most brave - and profitable - thing you can do," commented Chakravarthy V. The point is about choosing survival over pride.

Sunk cost fallacy, paper loss, and exit decisions for investors

"Investors are very familiar with the term "paper loss." If you don't sell, the loss isn't real; it's just a line on your portfolio tracker. But this delusion takes up time, chances, and emotional energy," stated Chakravarthy V. Chakravarthy V. added that delaying action can block better opportunities. Markets keep moving, even when investors feel frozen.

To reduce bias, Chakravarthy V. suggested a reset question. If the full portfolio became cash overnight, would you repurchase the same stocks at current prices. If the answer is no, holding needs a clear reason. The test removes attachment to the buy price. It also forces a decision based on today’s risk and merit.

"To say you lost means you were wrong. For a lot of investors, that seems impossible to bear. But to stay alive in the market, like on a mountain, you have to let go. Letting go of the top. Giving up pride. Letting go of the tale you told yourself about what should happen," said Chakravarthy V. Letting go is framed as a skill, not a defeat.

Viesturs reached Everest’s summit later, in 1990, when conditions improved. The earlier retreat protected the chance to return. Chakravarthy V. linked that lesson to capital protection. "As an investor, your money is the only thing that matters. It's like getting into a hurricane simply because you've come so far: wasting it on a lousy investment just because it used to look wonderful," added Chakravarthy V.

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