Why Emotional Biases Are Riskier Than Market Swings

Investing in the stock market often feels more emotional than analytical, especially during periods of high volatility. Emotions and past experiences can steer decisions away from careful analysis, leading to behavioural biases that influence when you buy, sell or hold. Financial experts warn that these biases can pose a greater threat to long-term returns than short-term market moves if they go unchecked.

“Investment isn’t just about numbers and spreadsheets. It’s more emotional and based on experiences and instincts,” said Ryan Gubic, founder of MRG Wealth. “Some of those instincts, while helpful in life, can quietly work against us when it comes to our money and personal finances.”

How behavioural biases shape investing decisions

When markets swing, common reactions include panic selling during downturns or chasing recently hot stocks. These are classic examples of behavioural bias at work: decisions driven by feeling rather than plan. Investors may also hold on to losing positions too long because admitting a mistake is painful, or they may double down on a winner after a short streak of success.

Brooke Dean, a senior wealth manager with BMD Financial Ltd. in Calgary, sees herd mentality frequently. This bias shows up when people pile into the same trades simply because others are doing so. “Once I hear people are buying gold bullion and they’re storing bars in their basement and things like that, that’s usually when it starts to top out,” Dean said. When everyone is talking about a trend and it seems like the crowd has already moved, it is often late to get in without taking unnecessary risk.

Overconfidence is another common pitfall, particularly among younger investors. After a few wins, some people convince themselves they have the market figured out and increase risk exposure. That approach can lead to sharp losses when the market turns. Dean stresses that many investors would benefit more from broad diversification and a long-term strategy than from continually trying to beat the market.

Gubic adds that acknowledging clients’ emotions is an important first step in addressing biased decision-making. “The goal really isn’t to eliminate bias, because I’d say that’s not realistic,” he said. “These are our human emotions. We’re going to feel it.” The practical objective becomes preventing emotions from dictating actions—so feelings are recognized but decisions remain disciplined.

A holistic financial plan keeps emotions in check

One effective tool to counter behavioural traps is a written, comprehensive financial plan. Gubic recommends a plan that goes beyond investments to include taxes, retirement, estate considerations, risk management and insurance needs. A structured plan creates clear guidelines for how to act in different market environments and reduces the temptation to react impulsively.

Ashley Agnew, a behavioural scientist and certified financial therapist at Edward Jones, describes a financial plan as “a living, breathing tool” that helps quiet the noise. “The brain wants a plan, and once your nervous system is at ease, that emotional overwhelm decreases and you can begin to insert logic again,” Agnew said. In other words, a plan restores perspective and makes it easier to follow disciplined steps rather than emotional impulses.

Agnew also suggests practical habits to reduce bias, such as playing devil’s advocate with your own ideas and actively questioning assumptions. Confirmation bias—the tendency to seek out information that confirms what you already believe—can be countered by deliberately considering opposing views. Simple practices like reflective journaling can increase self-awareness and help investors recognize patterns in their decision-making before those patterns harm the portfolio.

Beyond individual techniques, the combination of diversification, a clear written plan, and a process for checking emotions can significantly improve outcomes. Diversification spreads risk across different asset types and geographies, while a plan sets rules for rebalancing, when to realize gains or losses, and how to respond to life changes. Together these measures help ensure decisions are guided by financial goals rather than by short-term feelings.

When emotions flare, remember that reactionary moves are often costly. Pause, consult your plan, review the facts, and seek a second opinion if needed. Building a disciplined routine and a diversified, goal-focused portfolio can reduce the influence of behavioural biases and help preserve long-term financial health.

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