The markets have been rising for decades – and yet 70 percent of private investors lose money. The reason is not a lack of intelligence, but a brain that is still running in savannah mode. Three mental errors systematically sabotage your returns: loss aversion, herd instinct and confirmation bias. The good news: There is an antidote for everyone.
Why our Stone Age brain often gets in the way of the stock market
Loss aversion is one of the strongest psychological effects in investment decisions. Studies show that losses are felt about 2.5 times more strongly than gains of the same size. In the early history of humanity, this caution was essential for survival – anyone who lost their last supplies had a serious problem.
However, this characteristic often leads to wrong decisions on the stock market. You sell a fundamentally sound stock after a moderate decline out of fear, but at the same time you hold on to large losing positions because you don’t want to realize the loss. The paradox is that the more you want to avoid losses, the bigger they often become.
The herd instinct and its consequences
A clear example is the GameStop hype of 2021. Millions of investors bought shares at prices around $400 – primarily because everyone else was doing it too. Today the rate is around $25. A classic case of herd instinct.
Our brain interprets the mass as a safety indicator. In the early days this also made sense – those who traveled alone lived more dangerously. However, in the financial markets, the masses are often wrong, especially in extreme phases. Warren Buffett once put it this way: You should take action when others are anxious and be careful when everyone is euphoric.
A simple rule of thumb: If the hairdresser starts giving stock tips, be careful.
Confirmation Bias: Why We Only Hear What We Want to Hear
Another common thinking error is the confirmation bias, also known as confirmation bias. Anyone who has bought a share then prefers to look for information that supports this decision. Critical voices are hidden.
Professional investors consciously take the opposite approach. They actively look for counterarguments to their investments. Ray Dalio, billionaire hedge fund manager, follows a simple rule: For every investment thesis, he needs at least three valid counterarguments.
If you’re just looking for confirmation, you’re building an echo chamber – and that can become expensive at some point.
Five practical steps against emotional bad decisions
1. The 48-hour rule: There should be at least 48 hours between the impulse and the execution of a trade. Experience has shown that most emotional trading ideas resolve themselves during this time.
2. Use a stop-loss system: Before each purchase, set the maximum acceptable loss – around 10 percent. If the limit is reached, it is sold without further discussion.
3. Do counter research: For every stock you want to buy, find three reputable sources that speak against it. If the objections can be refuted, this speaks in favor of the purchase. If not, it’s better to wait and see.
4. Set up a fixed savings plan: Invest a fixed amount every month, regardless of the market situation. This principle, also called dollar-cost averaging, largely takes timing out of the equation.
5. Keep the portfolio manageable: More than ten individual stocks often lead to people diversifying widely out of uncertainty instead of investing out of conviction.
Why patience is the most important quality
The world’s most successful investors are rarely characterized by spectacular maneuvers. Warren Buffett has held some stocks for over fifty years. His principle: Time is the best friend of great companies and the worst enemy of mediocre ones.
An example: Anyone who had bought a single Amazon share for $18 in 1997 and simply held it would have a return of over 1,000 percent today. But this requires patience – a quality that is difficult for the human brain. It requires activity and new stimuli. Your own assets, on the other hand, benefit from peace of mind, time and the compound interest effect.
Conclusion: Discipline beats intelligence
On the stock market, it is less IQ than emotional discipline that determines long-term success. Those who act systematically instead of acting impulsively have a good chance of being among the investors who benefit in the long term.
A first concrete step can be to set up an automatic savings plan today – without any drama. The brain may protest. The account balance will thank you in the long term.