The Unseen Side of the Market: Numbers on a Screen or Tricks of the Mind?

Over the past few years, the conversations we eavesdrop on while walking the streets of Türkiye have changed dramatically. Whether on a ferry, a bus, or during a Sunday family breakfast, people are no longer just talking about politics or football; they are discussing "IPOs," "limit-up stocks," and "portfolio diversification." Especially in times of mounting inflationary pressures and economic uncertainty, the instinct to protect the value of our money triggers one of our most fundamental survival drives: the search for security. For millions of new investors, Borsa Istanbul has become not just a financial market, but a promise of psychological salvation.

But what exactly is going on in the depths of our minds as we stare at those green and red charts on our phone screens first thing in the morning? When making investment decisions, are we victims of financial statements or of our own evolutionary-wired brains? Let's put the economics textbooks aside and dive into the chaotic, yet utterly fascinating, psychological anatomy of the markets.

Social Comparison and FOMO: "Why Am I the Only One Losing?"

The primary motivation for many amateur investors entering the market today is not a deep belief in a company's future; it is the profit made by a neighbor, a coworker, or a social media influencer. This is perfectly explained by the Social Comparison Theory, introduced by renowned psychologist Leon Festinger in 1954. Human beings have an innate instinct to measure their own worth and success by comparing themselves to others.

When people in WhatsApp or Telegram groups boast, "I made enough money for a new car in one week from this stock," it sets off an alarm in the amygdala, our brain's threat-detection center. In the modern world, this threat is known as FOMO (Fear of Missing Out). For our ancestors, falling behind the herd meant becoming prey in the wild. Today, financially "becoming prey" means being crushed by inflation and losing social status. This fear is so powerful that it drives investors to pour money into the riskiest assets without reading a single company report, just to "jump on the very last wagon of the train."

The Dopamine Trap: A Casino in Our Pockets

To truly understand stock market psychology, we must also look at neurological processes. The trading apps on our smartphones operate on the principle of the Variable Ratio Schedule, a concept familiar in psychology from B.F. Skinner’s experiments on animals. Skinner proved that when rats do not know exactly when their food reward will come, they press the lever much more obsessively.

Just like a slot machine, every time you refresh your stock market screen, your brain gets a hit of dopamine. Seeing that your stock has gained a few percent that day stimulates the brain's reward center. After a while, the individual becomes addicted not necessarily to making money, but to the neurological thrill the market provides. This state obliterates rational investment decisions, creating a portfolio that melts away through trading commissions due to constant, impulsive buying and selling.

Loss Aversion and the Sunk Cost Fallacy

Nobel laureates Daniel Kahneman and Amos Tversky, considered the fathers of behavioral economics, rocked the financial world with their Prospect Theory. They proved a profound truth: the psychological pain of losing is approximately twice as intense as the pleasure of gaining the exact same amount. Making $1,000 makes you happy, but losing $1,000 will keep you awake at night.

In the stock market, when this is combined with the Endowment Effect, it turns into an absolute disaster. Investors refuse to sell a plummeting stock because accepting the loss means taking a heavy blow to the ego. Telling themselves, "It will bounce back eventually, patience pays off," they willingly ignore the deterioration in the company's fundamental data. In psychology, this is called the Sunk Cost Fallacy. However, closing a losing position is much like amputating a gangrenous finger; it hurts terribly, but it saves your life.

The Illusion of Control and the Dunning-Kruger Effect

Especially during a "bull market," those periods recently seen in Türkiye where the market rises continuously and almost every purchased stock yields a profit. A fascinating psychological illusion occurs. This is where the Illusion of Control, defined by Harvard University’s Ellen Langer in 1975, comes into play. Humans have a tendency to believe they have control over events that are entirely random or dependent on external factors.

As the market is propelled forward by a macroeconomic tailwind, the resulting profits are often attributed to the investor's own "superior financial intellect." This leads to the Dunning-Kruger Effect, a cognitive bias where individuals with low ability at a task overestimate their ability, dragging the investor into a state of dangerous overconfidence. People start selling their cars, remortgaging their homes, or taking out loans to invest. Yet, when the market winds change direction, these same individuals never blame themselves; suddenly, it is the fault of "the system," "manipulators," or "external forces."

Conclusion: You Cannot Manage a Portfolio Without Managing Your Mind

The stock market is not merely a place where companies are valued; it is a giant psychology laboratory where wealth is transferred from the impatient to the patient, from the impulsive to those who can regulate their emotions. It is impossible to completely rid ourselves of these cognitive distortions—they are part of being human. However, being aware of these biases means engaging your Emotional Intelligence (EQ) while investing. If your heart beats faster right before making a trade, you are acting with your amygdala, not your rational mind. Remember: the most profitable investment is the safeguard you build against the vulnerabilities of your own mind.

Kaynakça

• Festinger, L. (1954). A Theory of Social Comparison Processes. Human Relations, 7(2), 117-140.
• Kahneman, D., & Tversky, A. (1979). Prospect Theory: An Analysis of Decision under Risk. Econometrica, 47(2), 263-291.
• Kruger, J., & Dunning, D. (1999). Unskilled and Unaware of It: How Difficulties in Recognizing One's Own Incompetence Lead to Inflated Self-Assessments. Journal of Personality and Social Psychology, 77(6), 1121-1134.
• Langer, E. J. (1975). The Illusion of Control. Journal of Personality and Social Psychology, 32(2), 311-328.
• Skinner, B. F. (1953). Science and Human Behavior. Macmillan.
• Thaler, R. H. (1999). Mental Accounting Matters. Journal of Behavioral Decision Making, 12(3), 183-206.