Have you ever found yourself staring at your smartphone with adoration, convinced it represents the zenith of technology simply because it belongs to you? If you're silently agreeing, rest assured, you're in good company. This seemingly simple act reveals much more than our predilection for gadgets; it uncovers a psychological pattern that seeps into our investing habits, potentially shaping our financial well-being in significant ways.

Imagine you're an investor. Reflect on the stocks and assets in your portfolio. Trying to weigh them against the ones you didn't pick is a challenging task, isn't it? This challenge arises from certain quirks of our mind, known as the endowment effect and post-purchase rationalization. These terms aren't just academic jargon; they represent psychological pitfalls that can deeply influence our investment decisions and, consequently, our financial destiny.

The endowment effect is a fascinating aspect of human psychology, persuading us that anything we possess is of higher value than it might actually be. Envision this: every scribble in your notebook starts to seem like a masterpiece, simply because it's yours. This effect transforms us into unwitting collectors, valuing our possessions more dearly than others might. Ever hesitated to sell a toy at its original price, just because it's yours? That's the endowment effect in action, compelling us to cling to our belongings more tightly simply because we own them.

Then, there's post-purchase rationalization, a mental gymnastic we perform after acquiring something, convincing ourselves that it was the best decision ever made. It's akin to purchasing a magic bean and then assuring ourselves it will grow into a beanstalk reaching the skies, despite some inner doubts. This mental maneuver is how we reconcile our choices, comforting ourselves with the belief that we have a special talent for making unbeatable investment decisions, even when our picks are rather mundane. It's a mixture of confidence and mild illusion, turning our investment journey into a whimsical adventure where we're the protagonists with unparalleled foresight.

It's a tough truth to accept, but these psychological biases are a fundamental part of us, interwoven with our decision-making from beginning to end. However, becoming aware of them is the first step toward reducing their impact. While it's impossible to completely rid ourselves of these biases (nor would we want to, as they play a crucial role in decision-making efficiency), recognizing their existence enables us to refine our investment strategies, making them less susceptible to our mental whims.

The goal isn't to eliminate these biases but to manage them effectively. They serve as mental shortcuts that allow us to navigate through life's countless decisions without getting bogged down in endless deliberation. Essentially, they're a form of cognitive saving, enabling us to make swift decisions based on simple rules of thumb. Yet, when it comes to investing, these shortcuts can lead us astray, causing an emotional attachment to stocks or assets that obscures their actual value.

The endowment effect and post-purchase rationalization are particularly dangerous biases for our financial health. They lure us into holding onto failing stocks because of a sense of loyalty or prompt us to invest more in them without a logical basis, just because they're ours. This scenario is not hypothetical; it's a real danger that can deplete our portfolios and, in the worst-case scenario, lead to financial disaster.

Indeed, these biases can lead you to be overly skeptical of clearly beneficial investment opportunities simply because they're not part of your current portfolio. This is a textbook example of the endowment effect, where the tendency to overvalue what you own and undervalue what you don't can result in overlooked opportunities and a portfolio that lacks diversification.

The endowment effect and post-purchase rationalization pose significant challenges precisely because they can prevent you from learning from your mistakes. By convincing yourself that your current holdings are more valuable than they actually are, or rationalizing past investment decisions as flawless, you may miss out on the chance to correct course and make more informed choices in the future. This inability to learn from errors and adapt can hinder your growth as an investor, potentially leading to a cycle of repeated mistakes and missed opportunities for improvement and success.

Being true to oneself, have you ever found yourself purchasing stocks on the recommendation of so-called gurus or experts, only to watch your investment diminish over the years, while still defending your initial decision? This scenario illustrates post-purchase rationalization perfectly. It's a psychological snare that can lead to a vicious cycle of repeated errors and missed chances for growth and betterment. The very act of buying the stock was perhaps your inaugural misstep, one that you're reluctant to acknowledge. Instead, there's a tendency to cast blame elsewhere. You're not in isolation here; many investors share this predicament. It's akin to a poorly performing AI model that fails to learn from its faults, continuously hemorrhaging money.

Regrettably, even when those very gurus or experts alter their opinions, acknowledging their shift in perspective, many of these "bad model investors" struggle to heed the new advice. They remain entrenched in their old ways, blind to enlightenment. They might even go as far as denouncing these experts as "traitors" or "sellouts" for revising their views. This stubborn adherence to post-purchase rationalization is a challenging cycle to interrupt.

Holding onto a plummeting stock, convinced it will bounce back despite clear market warnings to the contrary, or continuing to pour money into a familiar company, ignoring expert advice and objective data indicating it's time to cut losses, are not just simple mistakes. They are major blunders, driven by our inherent biases.

The journey of an investor is about much more than just mastering the markets; it's about comprehending the complexities of our own minds. By recognizing and managing the endowment effect and post-purchase rationalization, we equip ourselves with the necessary tools to make smarter, more logical investment decisions. This does not just protect our financial well-being; it also improves our decision-making in various aspects of life.

Ultimately, our goal is to sail through the vast sea of investing without being capsized by the undercurrents of our own biases. This challenge is daunting, yet with mindfulness, discipline, and a touch of humility, it's entirely feasible and incredibly rewarding. Indeed, the most valuable investment we can make is in understanding ourselves, turning our inherent biases from enemies into allies in our pursuit of both financial and personal achievement.

Just pose a straightforward question to yourself: When was the last occasion you ventured out of your comfort zone with your portfolio? If finding an answer proves difficult, it's a signal to examine your investment habits more closely. The endowment effect and post-purchase rationalization are two psychological biases that can foster a misleading sense of safety and hinder the expansion of your investment approach.

As we traverse the investment landscape, we encounter the endowment effect, turning investors into quasi-mythical guardians of their financial realms. This effect compels us to hold our investments too dearly, seeing them as irreplaceable treasures, and rendering the idea of letting them go nearly inconceivable. This emotional attachment incites various investment behaviors, such as eschewing diversification for the charm of a single, cherished asset, struggling to maintain objectivity, and missing out on new prospects that don’t shimmer as brightly as our current holdings.

One harmful consequence of these biases is the unwarranted comfort in believing that no further action, mental or physical effort, is required on your part. This is a perilous snare, as it can create a misleading sense of safety and a decrease in alertness, leaving you more vulnerable to market changes and less equipped to adapt to new opportunities and challenges. It's similar to a knight who, upon discovering a single, gleaming sword, declines to explore alternative weapons, even when confronting a dragon that necessitates a varied strategy. In essence, you end up learning nothing.

The intensity of this situation escalates among those who echo our sentiments. It's like entering an echo chamber, where our collective beliefs intensify our biases, creating a powerful cycle of reinforcement. We become ensnared in a hall of mirrors, each reflection bolstering our biases, rendering them seemingly more rational, and leading us toward increasingly irrational decisions.

What prompted your initial approach to me? Many sought validation of their choices, wishing to be assured that their investment biases were not merely reasonable but indicative of astute decision-making. Despite my attempts to provide alternative viewpoints, the predilection for affirmation often results in a selective reception of my counsel, further solidifying these biases.

Think about your followers on X.com. Who do you choose to exclude, and whom do you decide to include? You're essentially crafting your own echo chambers with the tweets you interact with.

The endowment effect and post-purchase rationalization can become deeply embedded, making it difficult for us to listen to wise counsel, whether it comes from others or from within. However, taking steps—such as selling a portion of the stocks we hold or purchasing ones we don't—can act as a potent remedy. These actions force us to confront our biases head-on, similar to breaking a spell.

Drawing parallels from gaming and cinema, confronting these biases directly can be compared to a pivotal moment in 'Bloodborne'. Defeating Rom, the Vacuous Spider, and suddenly perceiving the world as it truly is mirrors the revelation that comes with challenging our biases, exposing the real nature of our investment choices.

Likewise, it's akin to opting for the red pill in 'The Matrix', choosing to confront the often harsh reality over the comforting illusion of a fabricated world. Although tough, this decision marks the beginning of turning daunting realities into opportunities for growth.

Here's the final revelation: For around a year, I've championed AI, encouraging you to witness the revolution unfolding on an unmatched scale. Now, picture my current "AI" portfolio. This is your litmus test to ascertain whether you're still clinging too tightly to your biases.

Another critical test is to see if you can escape the echo chambers of groups that bolster your biases. Trust exclusively in yourself. You are your own savior.

I would be truly pleased if you could break away from me in that respect, especially if your main reason for following me stems from the endowment effect and post-purchase rationalization influencing your portfolio decisions.

As a fellow human, you're absolutely welcome to stay. My only concern is that I don't want to be a source of any unhappiness for you.

I'm aware that some have exited the market entirely, heeding my advice, and for that, I am deeply grateful for your decisions.

I sincerely hope for all of you to find greater happiness and gain deeper insights.

There's a joyful life out there beyond the market. I hope you discover it.

PS. Just so you know, there are dozens of behavioral biases that can influence your investment decisions. Some are still being uncovered, and others are the subject of ongoing research. I suspect they number in the hundreds. By being aware of these biases, you'll be in a better position to make more informed investment choices.