Background
During a discussion about stock investing, someone asked: Is there a system that can “win in the long run”? This dialogue starts from the definition of a system and gradually explores its core components and true objectives.
Key Concepts
- Scope of this series: Trend investing — not short-term trading or value investing
- Investment System: A set of rules repeatedly executed in an uncertain environment, not a single trading technique
- Positive Expectancy: A statistical outcome where gains exceed losses over the long term
- Uncertainty: The normal state of the market, which cannot be completely eliminated
1. Is There a Long-Term Winning System in Stock Investing?
Q: Is there a system in stock investing that can “win in the long run”?
Response: If “long-term winning” means stable survival with positive expectancy, then such systems exist. If it means long-term high returns with no drawdowns, such a system does not exist.
2. Why Is Long-Term Winning So Difficult?
Q: Why do many people feel that investing isn’t complicated, yet long-term winning is so hard?
Response: Because the operations themselves are simple, but results come from the statistical distribution of repeated behaviors, not from being right or wrong on a single decision.
3. What Exactly Is an Investment System?
Q: What exactly does “investment system” mean?
Response: An investment system is not a single trading technique, but a set of rules repeatedly executed in an uncertain environment.
4. What Does a System Include?
Q: What parts does this set of rules typically include?
Response: At least three parts:
- Under what conditions to enter the market
- Under what conditions to exit the market
- How much a single mistake affects the overall result
5. The Core Objective of a System
Q: What is the core objective of a system?
Response: Not to predict the market, but to manage uncertainty.
6. What Result Does a System Pursue?
Q: What result does a system ultimately pursue?
Response: To remain in the market over a sufficiently long period and continuously participate in the next opportunity.