INVESTOR LETTER #123
Circle of Competence
One of Warren Buffett's most famous investing principles is the Circle of Competence. It simply means investing only in businesses you truly understand. You don't need to understand every industry or every company. You only need to recognize the boundaries of your knowledge and stay within them. Knowing what you don't know is often more valuable than pretending you know everything.
INVESTOR NOTE
A business owner thinks in decades. A speculator thinks in minutes.
You Don't Have to Know Everything
Imagine someone asks you to buy a business in an industry you've never heard of, using technology you can't explain, selling products you don't understand. Would you feel confident? Investing shouldn't feel like guessing. It's okay to say, 'I don't understand this.'
What Is Your Circle?
Your Circle of Competence includes businesses whose products, customers, competition, and economics you genuinely understand. The size of the circle doesn't matter. What matters is knowing where its boundaries are.
Understanding Beats Intelligence
Investing isn't about having the highest IQ. It's about making decisions based on businesses you can reasonably predict. A simple business you understand is often a better investment than a complicated one you don't.
Complex Doesn't Mean Better
Many beginners believe that sophisticated businesses are automatically superior investments. In reality, complexity often makes future earnings harder to predict. Simple businesses can sometimes be the most profitable investments.
Stay Honest With Yourself
It's easy to convince yourself that you understand a company after watching a few videos or reading a couple of articles. True understanding means you can explain how the business makes money, why customers choose it, and what could cause it to fail.
Your Circle Can Grow
Your Circle of Competence isn't fixed forever. Every annual report you read, every industry you study, and every business you analyze gradually expands your knowledge. The goal isn't to stay small forever—it's to grow your circle through learning, not guessing.
Ignore the Fear of Missing Out
Every year, certain industries become extremely popular. You don't need to own every trending company. Missing an opportunity you don't understand is far less dangerous than investing in something you can't explain.
Confidence Comes From Understanding
When markets become volatile, investors who don't understand their businesses often panic. Those who understand exactly what they own are much more likely to stay calm during temporary price declines.
Ask Yourself Simple Questions
Before investing, ask yourself whether you understand how the company makes money, who its customers are, why it has an advantage, and what could threaten its future. If these questions feel difficult to answer, you're probably outside your circle.
The Circle Protects You From Expensive Mistakes
Most investing losses don't happen because investors lack intelligence. They happen because people become overconfident in businesses they don't fully understand. Staying inside your Circle of Competence won't help you catch every winner, but it can help you avoid many costly mistakes.
The Best Investors Know Their Limits
Great investors aren't successful because they know everything. They're successful because they know exactly what they know—and just as importantly, what they don't. Your biggest edge in investing isn't predicting the future; it's having the discipline to stay within your Circle of Competence.
INVESTOR PRINCIPLE