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Investment Psychology: Do Emotions Influence Investment Decisions?

Investing may, at first glance, seem straightforward: analysing information, assessing risks and making rational decisions. In practice, however, many investors end up behaving differently from what logic might suggest.

The explanation lies in investment psychology. Emotions, cognitive biases and human behaviour can have a significant impact on the way we make financial decisions. Even experienced investors can be influenced by fear, euphoria or the collective behaviour of the market.

Understanding these mechanisms is an important step towards investing with greater discipline and clarity.

What is investment psychology?

Investment psychology examines how emotional and behavioural factors influence financial decisions.

Contrary to what traditional economic theory suggests (which assumes that investors behave entirely rationally), in reality, investment decisions are often shaped by emotions and subjective perceptions.

Some of the most common factors include:

  • Fear of losing money;
  • Overconfidence;
  • The influence of other investors’ behaviour;
  • Emotional reactions to news or market volatility.

These reactions can lead to hasty decisions or choices that are not fully aligned with long-term investment objectives.

Why is it so difficult to make rational investment decisions?

Investing involves uncertainty. Whenever uncertainty exists, the human brain tends to rely on mental shortcuts (known as cognitive biases) to simplify complex decisions.

Although these mechanisms are natural, they can distort the way we assess risks and opportunities.

Some of the most common biases include:

1. Loss aversion

Most people experience the emotional impact of a loss more intensely than the satisfaction of an equivalent gain.

This phenomenon can lead investors to:

  • Avoid long-term investments that involve volatility because of concerns about short-term losses;
  • Sell assets too early to avoid losses;
  • Hold on to underperforming investments for too long in the hope that they will recover.

2. Herd behaviour

When markets rise rapidly or certain assets become particularly popular, many investors tend to follow the behaviour of the majority.

This herd behaviour can lead to decisions driven more by social pressure than by careful analysis.

As a result, investors may buy assets when they are already overvalued or sell during periods of widespread panic.

In this context, the concept of Fear of Missing Out (FOMO) often comes into play. It describes the fear of missing an investment opportunity that others appear to be benefiting from, prompting some investors to enter the market hastily, often when prices are already high.

3. Overconfidence

Another common phenomenon in investment psychology is overconfidence.

After experiencing positive results, some investors may believe that they can predict market movements more accurately than is actually possible.

This can lead to:

  • Taking excessive risks;
  • Trading too frequently;
  • Ignoring warning signs.

The impact of emotions on financial markets

When many investors react emotionally at the same time, their decisions can amplify market movements.

Periods of strong market gains can generate collective euphoria, while market downturns can trigger widespread panic.

For this reason, understanding investment psychology is not only useful at an individual level. It can also help investors better understand financial market cycles and behaviour.

How to reduce the impact of emotions when investing

Although it is impossible to eliminate the influence of emotions entirely, there are strategies that can help investors make more balanced decisions.

Some good practices include:

  • Defining clear investment objectives and risk tolerance;
  • Establishing a long-term investment strategy;
  • Avoiding impulsive decisions during periods of market volatility;
  • Diversifying investments to reduce risk;
  • Regularly reviewing the investment strategy based on reliable information rather than emotions.

Professional guidance and access to reliable financial information can also help investors adopt a more disciplined approach to investing.

Investment psychology shows us that investing is not simply a matter of numbers. It is also an exercise in self-control, discipline and understanding our own behaviour.

By recognising the emotional factors that influence financial decisions, investors can be better prepared to avoid common mistakes and remain focused on their long-term objectives.


This communication has been prepared by Banco Finantia for information purposes only and does not constitute investment advice or a recommendation to invest. In preparing this communication, no consideration has been given to any investor’s investment objectives, financial situation or specific needs. Accordingly, the information has not been tailored to any actual or potential investor, nor have any particular circumstances relating to such investors been taken into account.

The information provided is based on market conditions prevailing at the date of publication and on information obtained from recognised third-party sources of a public nature. Banco Finantia has not independently verified the data or information provided by such sources. By receiving this communication, the recipient acknowledges this fact and agrees that Banco Finantia shall not be held liable under any circumstances for any errors, omissions or inaccuracies contained herein or arising from the use of this information. Banco Finantia accepts no responsibility for any direct or indirect loss or damage that may result from transactions undertaken on the basis of the information provided.

Banco Finantia’s investment activities, whether conducted for its own account or on behalf of its clients, are entirely independent of the content of this communication. The Banco Finantia Group may hold positions in, or trade, the securities or financial instruments referred to herein before or after the publication of this communication and may provide, or seek to provide, banking services to the issuers of such securities or financial instruments.

Banco Finantia is supervised by the Portuguese Securities Market Commission (CMVM) and is registered with the CMVM under registration number 109.

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