Behavioural biases are common habits of the mind that affect how people make decisions. In the world of finance, these biases can affect how investors buy, hold, or sell stocks and other assets. Many people believe that investment decisions depend only on facts, market prices, and financial knowledge. However, emotions, personal beliefs, past experiences, and the actions of others also play a major role.
Traditional finance assumes that investors act in a rational way. This means they study the available facts and choose the option that best meets their goals. Behavioural finance, however, explains that people do not always act in this way. They may let fear, greed, or personal opinions affect their choices. As a result, they may make poor decisions even when they have access to useful information.
Overconfidence Bias
Overconfidence bias occurs when investors have too much faith in their own knowledge or skills. They may believe that they can predict market changes better than others. Due to this belief, they may buy or sell stocks too often or take risks without proper thought.
For example, an investor who earns a profit from a few stock trades may believe that they have a special skill in the market. They may then invest large sums of money without enough research. If the market moves in the opposite direction, they may face serious losses.
This bias can also lead to higher trading costs and poor returns. Investors can reduce this risk if they study the facts, accept that markets are hard to predict, and review their choices with care.
Herd Mentality
Herd mentality occurs when investors follow the choices of other people instead of making their own decisions. They may buy a stock because their friends, family, or other investors have bought it. They may also follow popular market trends without a clear idea of the risks.
For example, when a stock becomes popular, many people may buy it because they fear that they will miss a chance to earn a profit. Its price may rise due to high demand, even if its true value does not support that price. If many investors later sell at the same time, the price may fall sharply.
Herd mentality can cause people to buy assets at high prices and sell them during a market fall. Investors should study each investment on its own merits and avoid choices based only on public opinion.
Loss Aversion
Loss aversion refers to the tendency to feel the pain of a loss more strongly than the pleasure of an equal gain. For example, the sadness caused by a loss of ₹1,000 may feel greater than the joy of a profit of ₹1,000.
This bias can affect investment choices in many ways. Some investors hold a stock that has lost value because they hope its price will return to the level at which they bought it. They may refuse to accept the loss, even when the facts suggest that the stock may not recover. Others may avoid good investment options because they fear any chance of a loss.
Loss aversion can prevent investors from making sensible choices. A better approach is to study the current value and future prospects of an asset rather than focus only on its past price. Every investment should be judged on its own merits and level of risk.
Confirmation Bias
Confirmation bias occurs when people give more attention to facts that support their current beliefs and ignore facts that challenge them. In investment decisions, a person may believe that a company will perform well and read only positive news about it.
For example, an investor may continue to support a company even after it reports weak profits or faces serious business problems. They may focus on positive opinions and dismiss warnings from trusted sources. This can lead to poor choices and unexpected losses.
Investors can reduce this bias by reviewing both positive and negative information. They should ask whether the facts support their original decision and remain open to new evidence. A fair review of all relevant information can help them make more balanced choices.
Anchoring Bias
Anchoring bias occurs when investors rely too much on the first piece of information they receive. This may be the original purchase price of a stock, its highest market price, or a price target from an expert.
For example, an investor buys a stock at ₹500. Later, its price falls to ₹300. The investor may refuse to sell because they believe the price must return to ₹500. However, the company may have serious problems, and its current value may be much lower.
The original purchase price alone does not show whether a stock is worth its current price. Investors should review the company’s financial health, market position, and future prospects. They should base their decisions on current facts rather than a fixed number from the past.
Recency Bias
Recency bias occurs when people give too much importance to recent events and assume that the same pattern will continue. Investors may judge an asset mainly by its recent performance instead of its full record.
For example, after several months of rising stock prices, an investor may believe that the market will continue to rise. They may invest more money without a proper review of the risks. In contrast, after a market fall, they may believe that prices will keep falling and sell their assets in fear.
Recent events can provide useful information, but they do not always predict the future. Investors should study both short-term changes and long-term trends before they make important decisions.
Disposition Effect
The disposition effect refers to the habit of selling investments that have made a profit too early while holding investments that have lost value for too long. Investors may prefer to secure a small profit because it feels good. At the same time, they may avoid selling a poor investment because they do not want to accept a loss.
For example, an investor buys two stocks. One rises in value, while the other falls due to weak business results. The investor sells the first stock to secure a profit but keeps the second stock in the hope that its price will rise again.
This approach may harm long-term returns. Investors should review each asset based on its current value, risks, and future prospects. The decision to sell or hold should depend on facts and financial goals, not only on the desire to avoid regret.
Effects of Behavioural Biases on Investment Decisions
Behavioural biases can lead to several problems. First, they may cause poor portfolio diversification. Investors may place too much money in a company or asset they know well, rather than spread their funds across different assets. This can increase the risk of loss.
Second, these biases may lead to excessive trading. Overconfident investors may buy and sell too often, which can raise costs and reduce their returns. Emotional choices can also cause investors to buy when prices are high and sell when prices are low.
Third, biases can affect how people judge risk. Some investors may take too much risk after a period of profit, while others may avoid useful opportunities after a loss. These choices can prevent them from reaching their financial goals.
Over time, repeated mistakes can reduce wealth and make it harder to follow a clear investment plan. A better understanding of human behaviour can help investors avoid many of these problems.
Ways to Reduce Behavioural Biases
Investors can reduce the effects of behavioural biases through a few simple habits. They should set clear financial goals and follow a long-term investment plan. This can help them avoid sudden choices based on fear, greed, or market rumours.
They should also spread their money across different asset classes to reduce dependence on a single investment. Before they buy or sell an asset, they should study reliable facts and review both the benefits and the risks.
Regular portfolio reviews can help investors check whether their investments still match their goals. However, they should avoid constant changes in response to daily market movements. Systematic investment plans and clear rules for investment decisions can also help them stay disciplined.
When necessary, investors can seek advice from a qualified financial adviser. An independent view may help them notice errors that they might miss on their own.
Conclusion
Behavioural biases have a strong effect on investment decisions because people do not always act on facts alone. Overconfidence, herd mentality, loss aversion, confirmation bias, anchoring bias, recency bias, and the disposition effect can all lead to poor choices.
These biases may cause excessive trading, weak risk control, poor diversification, and lower returns. However, investors can reduce their effects through research, clear goals, a balanced portfolio, and a disciplined approach.
The main lesson is that good investment decisions require more than financial knowledge. Investors must also understand their own habits, emotions, and beliefs. When they recognise these weaknesses and base their choices on facts rather than feelings, they have a better chance of meeting their long-term financial goals.
ALSO READ: Tokenisation: The Next Chapter in Digital Finance.
