Cognitive biases that undermine the profitability of retail investors

Investing is not solely about numbers or the intention to focus on future gains, nor about whether the investor keeps potential risks in mind. In fact, in many cases, the greatest risk is not found in the market, but in the investor’s own mind.

Over time, numerous studies have shown that retail investors tend to achieve worse results than the markets in which they invest. What is the reason for this? It is usually not due to a lack of information, but something much more subtle: cognitive biases.

Understanding them not only helps improve decision-making, but can also make the difference between a coherent strategy and a portfolio that constantly changes without a clear direction.

What cognitive biases are and why they affect your money

Cognitive biases are systematic distortions in the way we interpret information and make decisions. They are not occasional mistakes, but recurring patterns of thought that affect all individuals, especially in uncertain environments such as investing.

Instead of analysing each situation completely rationally, the brain uses automatic mechanisms based on past experiences, emotions and subjective perceptions. This helps us make decisions faster, but also introduces errors that, in finance, can lead to suboptimal decisions.

When investing, we do not only analyse the data presented to us. We also react to:

• News


• Opinions


• Market movements


• Past experiences

And this is where biases begin to influence, often without us being fully aware of it.

Loss aversion bias: why fear outweighs returns

One of the most well-known biases is loss aversion. In simple terms, losing money hurts more than gaining it feels rewarding. This leads to behaviours such as:

• Selling during downturns out of fear of further losses


• Avoiding investing after a bad experience


• Prioritising absolute safety, even if it means losing purchasing power

The result is usually the same: decisions driven by emotion rather than strategy.

Confirmation bias: you only see what you want to see

Investors do not usually look for neutral information, but rather for information that confirms what they already believe.

If someone believes the market will rise, they will consume content that reinforces that idea. If they fear a crisis, they will look for signals that justify it.

This bias leads to:

• Ignoring real risks


• Overestimating opportunities


• Holding investments that no longer make sense

Good investing requires constant questioning, not self-confirmation.

Herd behaviour: when the market decides for you

Few investors are completely immune to social pressure. When everyone is talking about an investment, it is difficult to stay on the sidelines. This explains phenomena such as:

• Buying at market peaks


• Entering trends too late


• Following popular decisions without independent analysis

The problem is that the market does not reward following the crowd, but making decisions based on independent judgment.

Overconfidence: the silent bias

After several successful decisions, many investors fall into the trap of believing they control the market. This results in:

• Increasing risk without justification


• Reducing diversification


• Trading more frequently

In the long term, this excess activity usually harms returns. In investing, doing more does not always mean doing better.

Short-term bias: the obsession with immediacy

One of the most common mistakes is evaluating long-term investments with a short-term mindset. This leads to:

• Constantly reviewing the portfolio


• Reacting to daily movements


• Changing strategy without structural reasons

When the time horizon shortens, volatility becomes unbearable.

How these biases affect real returns

The impact of these biases is not theoretical. It translates into specific decisions:

• Entering and exiting at the wrong times


• Taking on more risk than necessary


• Keeping money idle out of fear


• Abandoning valid strategies too early

Overall, this usually results in lower returns than those that would have been achieved by simply maintaining a consistent strategy.

The solution is not to eliminate biases, but to design around them

No one is completely free from biases. The key is not to avoid them entirely, but to reduce their impact through portfolio structure. Some ways to do this:

• Define a clear investment plan


• Diversify across asset types and time horizons


• Avoid impulsive decisions


• Focus on investments with clear rules

This is where an important concept comes into play: predictability.

Investing with clear rules reduces emotional impact

The more an investment depends on the market, the greater the emotional burden for the investor. By contrast, when there are:

• Defined timeframes


• Known returns


• Specific operations

decision-making becomes much more rational.

Investments linked to the real economy, such as invoice financing, allow this type of structure to be introduced into a portfolio.

Inversa as a tool to invest with greater control

Within a diversified strategy, solutions such as Inversa allow investors to access operations with characteristics that help reduce the influence of biases:

• Short and defined timeframes


• Returns known from the outset


• Independence from market volatility


• Ability to diversify operation by operation

This does not eliminate risk, but it reduces the need to constantly react to the market, helping maintain a more stable strategy over time.

Investing better is not always about knowing more, but deciding better

Many investors constantly look for new opportunities, products or strategies. However, in many cases, the real improvement lies not in what is invested, but in how decisions are made.

Understanding cognitive biases is the first step to preventing them from working against you.

If you are looking for a way to invest with greater predictability, less emotional dependence and a direct connection to the real economy, Inversa offers an approach designed precisely for that.