🔎 Reading the Numbers · Lesson 6 of 8 · 7 min
Moats: Why Some Companies Win for Decades
🏰 Anyone can have one great year. The companies that mint money for decades have something a competitor can't just copy over a weekend — a 'moat.' It's Warren Buffett's favorite word, and once you see moats, you can't unsee them.
💡 Key idea
A moat is a durable edge rivals can't easily copy — brand, network effects, switching costs, or scale. It protects profits for years.
🧠 Why it matters
An ECONOMIC MOAT is a durable competitive advantage that protects a company's profits from rivals — the business equivalent of a castle's moat. The common types: a powerful BRAND people will pay more for (premium labels), NETWORK EFFECTS where the product gets more valuable as more people use it (marketplaces, social platforms), HIGH SWITCHING COSTS that make leaving painful (the software your whole company runs on), and COST/SCALE advantages that let a giant undercut everyone. A wide moat means a company can defend high profits for years; a no-moat business sees its profits competed away fast. Great long-term investors hunt for wide, durable moats.
🌍 In the real world
💡 Why can one soda company charge more than a generic that tastes nearly identical? Brand moat. Why is it painful to leave a platform where all your friends already are? Network effect. Those moats let both businesses defend fat profits decade after decade.
📌 Takeaways
- A moat = durable advantage competitors can't easily copy
- Types: brand, network effects, switching costs, scale
- Wide moats defend profits for years; no moat = profits competed away
📖 Terms in this lesson
Moat: A lasting advantage that keeps competitors away, like a brand, a network or a cost edge.
✅ Test yourself
What is an economic 'moat'?
- A company's debt
- A durable competitive advantage that protects its profits
- A type of stock
- The CEO's bonus
Answer: B · A durable competitive advantage that protects its profits
It's a lasting edge — like a castle's moat — that keeps competitors from eroding profits.
Which is an example of a 'network effect' moat?
- A cheap factory
- A platform that gets more valuable as more people join
- A patent
- A big ad budget
Answer: B · A platform that gets more valuable as more people join
Network effects mean each new user makes the product more valuable — hard for rivals to overcome.
Why do investors love wide-moat companies?
- They're cheap
- They can defend high profits for many years
- They pay no taxes
- They never grow
Answer: B · They can defend high profits for many years
A durable moat protects profits from competition, supporting strong returns over the long run.
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