Summary of Key Points
This article explains, from the perspective of how the brain functions, why continuously declining stock markets cause investors to make impulsive decisions and how to overcome this phenomenon known as “decision fatigue.” The key solution is to give the brain a 48-hour period of rest to allow reason to return, preventing irremediable mistakes driven by emotions. This advice is not only applicable to stock trading but also to all major life decisions that require rational judgment.
Why Does Continuous Decline Make It Hard to Think Clearly?
You can think of your brain as a “dual-system computer”:
- The Rational System (prefrontal cortex): Similar to the CPU of a computer, it is responsible for calculating, assessing risks, and controlling impulses (such as resisting the urge to buy high and sell low). However, it operates slowly and consumes more energy.
- The Emotional System (amygdala): Acting like an emergency program, it handles instinctive reactions such as fear and greed. It works quickly but is less precise (for example, you might want to sell immediately upon seeing a sharp drop in prices).
Normally, the rational system suppresses the emotional system, keeping you calm. But after 12 consecutive days of decline, making countless decisions about whether to sell or not is like constantly depleting the computer’s battery. The dramatic fluctuations on July 17th and 21st were like a sudden power surge for a battery that’s already low, causing the rational system to shut down completely, and the emotional system to take over, shifting you from a “rational mode” to a “survival instinct mode.”
In simple terms, continuous declines are like a gradual loss of energy, while sharp rises and falls are like sudden power outages, leaving you with only instinctive reactions.
What Pits Do You Fall Into Under Decision Fatigue?
When the rational system is disabled, your decisions become more emotional, typically following these four steps:
1. Hope for the Best: “The market has dropped so much; it should rebound soon.” (Emotions override rational analysis.)
2. Panic Totality: “The market is ruined! The AI bubble has burst! Run!” (Only risks are seen, no opportunities.)
3. Panicked Selling: “I’m no longer losing money; I must sell right away!” (Driven by previous fear, even if prices might rise later.)
4. Giving Up: “Whatever happens, I don’t care anymore.” (Cognitive resources are exhausted, leaving no energy for decision-making.)
These decisions are not based on rational analysis but on emotions—just like a person who is extremely hungry eating anything available, regardless of its healthiness.
Why Do You Feel More Exhausted on Weekends?
Weekends are supposed to be a time for the brain to rest, but anxious investors often do two things that counter this effect:
1. Overwhelming Information Consumption: They scour financial news, social media, and expert reports, but without real-time stock price updates. These unfounded expectations add to the brain’s workload.
2. Regretful Overthinking: “If only I had sold last week” or “I shouldn’t have invested in tech stocks.” This type of negative thinking consumes a lot of mental energy, leaving the brain even more tired by Monday’s opening.
As a result, weekends don’t provide any recovery; instead, they further deplete your brain’s resources, making it harder for the rational system to function effectively on Monday.
How to Use the 48-Hour Rule to Overcome Decision Fatigue
The article suggests a simple and effective method: avoid making any trading decisions for 48 hours after a significant loss. The steps are:
1. Reduce Your Exposure: Lower your position size to a level where you can remain calm (for example, keep only 10% of your portfolio), so you don’t need to constantly monitor the market.
2. Abstain from Four Actions: No trading, no position adjustments, no leverage usage, and no firm commitments (like “I must sell tomorrow”).
3. Observation Only: You can watch market trends, take notes, and analyze reasons, but avoid taking action. This allows the rational system to gradually regain its strength.
Research shows that those who make decisions within 24 hours have lower returns compared to those who wait 48 hours. The 48-hour period gives emotions time to cool down, allowing reason to take control again.
Decision Fatigue Affects More Than Just Stock Trading
Decision fatigue is not unique to stock markets. For example, if you experience a series of negative events such as a failed negotiation, a argument with a partner, and a financial loss within a week, decisions like breaking up, quitting a job, or making a major purchase might be driven by emotions rather than reason.
The principle behind the 48-hour rule applies to life’s big decisions as well: give yourself two days to calm down after a significant emotional shock. For instance, if you’re considering breaking up after an argument, don’t make hasty decisions; wait a couple of days before acting. Waiting won’t make things worse but can help you avoid making the most costly mistakes.
In Conclusion
Whether it’s stock trading or everyday life, don’t make important decisions when you’re emotionally charged. Give your brain some time to “reboot.” Only when you return to rationality can you make wiser choices. After all, taking things slow might not always lead to losses, but rushing into wrong decisions will definitely result in losses.