PDF Summary:The Mental Game of Trading, by Jared Tendler

Trading success isn't just about strategy and market analysis—your emotions play a critical role in your ability to make sound decisions and execute trades effectively. In The Mental Game of Trading, Jared Tendler explains how emotions like greed, fear, and overconfidence can derail your trading performance and create destructive patterns that are difficult to break.

Tendler argues that managing emotions in the moment is ineffective and unsustainable. Instead, he teaches you how to identify the underlying performance flaws—such as biases, unrealistic expectations, and faulty logic—that trigger emotional reactions in the first place. By addressing these root causes and building mental strength, you can eliminate the need for constant emotional regulation and achieve more consistent, profitable trading results.

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(Shortform note: While personal issues can spill over into trading activities, this isn’t always the case. For example, quantitative trading firms use rule-based systems to execute trades, minimizing the impact of individual traders’ personal issues. In Inside the Black Box, Rishi Narang explains that these firms design their systems to be fully automated, reducing the influence of human emotions and personal issues on trading decisions. This approach allows them to maintain consistent execution regardless of individual traders’ emotional states.)

To keep personal issues from affecting your trading, Tendler suggests isolating your trading mindset. Sixty minutes before you begin trading, jot down all your thoughts on that topic. They might include your emotions, certain ideas, a pragmatic list of tasks, or messages you wish to convey to other people. Dedicate a maximum of 20 minutes to this. Then, set a mental boundary to keep personal concerns out of your mind throughout the trading session. If additional thoughts linger in your mind, spend a short time jotting them down to reinforce the bubble.

The Downside of Isolating Your Trading Mindset

While isolating your trading mindset can help you focus, it may also have some psychological downsides. In White Bears and Other Unwanted Thoughts, Daniel M. Wegner explains that trying to keep personal concerns out of your mind can backfire. When you try to suppress a thought, your mind actually becomes more likely to think about it. This can make the unwanted thought even more intrusive and emotionally destabilizing over time. So, while isolating your trading mindset can help you focus, it may also make it harder to manage your emotions in the long run.

Common Emotional States & Their Manifestations

Desire for more is a common emotional state that can manifest as overconfidence, anger, or anxiety. According to Tendler, overconfidence is the belief that you can easily profit from a trade. Anger is the emotion that results from a series of losses, and fear is the fear of missing out on an opportunity. Greed can also indicate insufficient self-assurance. You may believe that whatever you earn won't ever be satisfactory. You may be driven by the false idea that more money will bring enduring fulfillment, self-esteem, or self-assurance. You might attempt to swiftly remove any uncertainty regarding your capacity to earn money. Tendler believes greed is inherent to human nature. It's not a problem in itself, though it may cause issues when it leads to poor decision-making.

(Shortform note: In The Heart of the Buddha’s Teaching, Thich Nhat Hanh argues that greed is one of the three poisons of the mind, along with hatred and ignorance. He believes that these three poisons are the root causes of suffering and that they prevent us from experiencing true happiness and peace. Hanh explains that greed is a form of craving that arises from a sense of lack or dissatisfaction. When we’re greedy, we’re never satisfied with what we have and are always seeking more. This constant craving leads to suffering because it creates a sense of restlessness and discontent. Hanh teaches that the antidote to greed is generosity. By practicing generosity, we can cultivate a sense of contentment and learn to appreciate what we have.)

To fix the issues greed creates, you need to identify the deep-seated problems, misperceptions, or biases that make your ambition become greed. Then you can make choices that align with your plan, confident you'll maximize long-term earnings.

Behavioral Finance and the Roots of Greed

Tendler’s approach to greed is rooted in the field of behavioral finance, which studies how psychological factors influence financial decision-making. In Beyond Greed and Fear, Hersh Shefrin argues that what people call “greed” and “fear” in financial markets are really the observable consequences of deeper cognitive and emotional biases—such as overconfidence, mental accounting, loss aversion, and regret aversion—which cause investors to make systematic, predictable errors that lead them away from the rational, long-horizon wealth-maximizing choices described by traditional finance.

Methods to Solve Flaws and Achieve Better Performance

To resolve flaws and enhance performance, Tendler suggests building mental fortitude and determination to strengthen your discipline. He says that mental fortitude is the force supporting the reasoning for your routines, whereas willpower fuels the repeating required to create those routines.

Tendler argues that by urging yourself to show discipline during difficult periods, you can boost your willpower and mental strength. If you feel the urge to succumb to being undisciplined, strive to improve. Meanwhile, reinforce the reasoning behind the habit.

(Shortform note: Tendler’s advice to urge yourself to show discipline during difficult periods may backfire if you interpret it as pushing yourself harder regardless of your mental or emotional state. In The Willpower Instinct, Kelly McGonigal explains that self-criticism is consistently associated with less motivation and worse self-control. Both guilt and stress tend to undermine the very self-discipline we are trying to strengthen by shifting the brain into a state that favors immediate relief and short-term rewards over our long-term goals.)

We'll next discuss identifying and diagnosing performance issues, taking corrective action, and maintaining performance stability.

Determining and Diagnosing Performance Shortcomings

Tendler suggests becoming aware of your emotional tendencies and charting them to identify trading errors. Feelings, ideas, behaviors, and trading choices offer information about how we function on an instinctual or subconscious level. By examining the evidence, you can assume the position of a forensic detective. You can discover what triggered your emotional reactions by examining the aftermath of that explosive event.

Tendler argues that by examining it, you can entirely shift your viewpoint on the emotional event, since it offers crucial insights into its precursors and underlying flaws. Both are crucial for solving the problem and stopping future blow-ups. Begin examining the precise feelings, thinking, behavior, and choices that are instinctively prompted during trading. This information will help you comprehend the problem in its entirety.

The Origins of Emotional Charting

Tendler’s suggestion to chart your emotional reactions like a forensic detective is rooted in cognitive-behavioral therapy (CBT). CBT is a school of psychology that focuses on the relationship between thoughts, feelings, and behaviors. CBT therapists often use a technique called “case conceptualization” to help clients understand the underlying causes of their emotional reactions. This involves creating a detailed map of the client’s thoughts, feelings, and behaviors, and identifying the specific beliefs that drive their responses. By examining the evidence, clients can gain a deeper understanding of their emotional patterns and develop strategies to change them.

Tendler also suggests pinpointing the underlying reasons for any deficiencies in your performance. He defines performance flaws as biases, illusions, and learning mistakes that impede progress or cause inconsistency in your advancement.

(Shortform note: Tendler’s definition of performance flaws is missing a key component: cognitive fatigue. This is the idea that your brain has a limited amount of energy to make decisions, and as you use up that energy, your decision-making quality decreases.)

Interventions for Corrective Action and Consistent Performance

Tendler recommends using a structured approach to diagnose and address mindset challenges. This enables you to pinpoint the source of your issues, track your progress, and make adjustments as needed. To implement a structured approach, first describe the issue in detail. Then, explain the logical reasons behind experiencing this issue. Next, explain why your logic in the last step is flawed. Finally, devise a way to fix that faulty reasoning and explain why it's valid.

(Shortform note: Tendler’s structured approach to diagnosing and addressing mindset challenges has a long history. In the 1970s, psychiatrist Aaron T. Beck developed cognitive therapy, a structured approach to treating depression and anxiety. Beck’s approach involved identifying and challenging negative thought patterns, helping patients reframe their thinking and develop healthier perspectives. This method laid the foundation for modern cognitive-behavioral therapy (CBT), which remains a widely used and effective treatment for various mental health conditions.)

Additionally, Tendler suggests recognizing and celebrating minor gains to boost confidence. If you don't notice small improvements, you might give up on a strategy that’s actually working.

(Shortform note: Recognizing and celebrating minor gains can backfire if you don’t also check your overall results. If you keep celebrating every small win, you might condition yourself to keep using a strategy that’s actually losing money over time.)

We will now discuss how to disrupt emotional patterns and reinforce correct execution.

Proactive Interruption of Unproductive Patterns

Tendler suggests interrupting emotional cycles immediately after noticing them. Disruption is meant to separate the reaction from the correction, increasing the odds that the correction will be effective.

To disrupt emotional patterns, Tendler recommends four methods: Inhale deeply, write down your thoughts or emotions, get up or take a walk, or talk to a coworker, post in a digital group, or talk to other trading friends.

(Shortform note: Tendler doesn’t specify when to use each of these methods, but psychology research suggests that you should choose a method based on how early you catch the emotional shift and how intense it is. For example, if you catch the emotional shift early, you might be able to disrupt it with a deep breath.)

Reinforcing Correct Execution

Tendler also suggests using a Reminder for Strategy to enhance execution. This is a straightforward cue that can safeguard how you make decisions and boost the likelihood of executing better. It can also improve your decision-making where it's lacking.

Being more emotionally stable doesn't ensure you'll be mistake-free. When your mind malfunctions, the strategic and technical sides of trading can vanish, making you trade in ways that don't align with your plan. Utilizing a Tactical Reminder may help stop this from occurring.

When crafting your Strategy Reminder, consider what occurs in emotional situations and list your most frequent errors.

(Shortform note: To create a Strategy Reminder or Tactical Reminder, write a simple “if-then” statement that you can keep next to your trading screen. For example, “If I notice [specific emotional cue], then I will immediately do [specific trading step].” This “implementation intention” can help you automate your response to emotional triggers and reduce the cognitive load during trading. By having a clear, actionable plan, you can more effectively manage your emotions and maintain discipline in your trading decisions.)