Advanced 6 min read

Moats — What Makes a Great Business Great

Competitive advantages, returns on capital, and why some companies print money for decades.

Why a Great Business Beats a Cheap Stock

Charlie Munger famously said: "A great business at a fair price is superior to a fair business at a great price."

A cheap stock that's losing market share will keep getting cheaper. A great business compounds value year after year — even if you slightly overpay, time is on your side.

This lesson is about how to find the great ones.

The Five Classic Moats

1. Network Effects

Each new user makes the product more valuable for everyone else. Examples: Visa, Mastercard, Meta, marketplaces.

2. Switching Costs

It's painful, expensive, or risky to leave. Examples: enterprise software, banks, medical devices, ERP systems.

3. Intangible Assets

Brands, patents, regulatory licenses, decades of trust. Examples: luxury brands, pharma patents, ratings agencies.

4. Cost Advantages

Producing the same thing cheaper than anyone else. Examples: Costco, GEICO, large-scale miners.

5. Efficient Scale

A market only big enough to support one or two players profitably. Examples: pipelines, regional utilities, niche industrials.

The Numbers Behind a Moat

Moats show up in the financials before they show up in headlines:

  • ROIC > 15% sustained for many years
  • Stable or expanding gross margins
  • Pricing power — revenue grows faster than unit volume
  • Low capital requirements to grow

A company with 25% ROIC for a decade isn't lucky. It's protected.

Signs the Moat Is Eroding

Even great businesses can lose their advantage. Watch for:

  • Margins shrinking despite revenue growth
  • New entrants taking market share quickly
  • Big spending required just to stand still
  • Customers becoming more price-sensitive
  • Regulators or technology shifts that neutralize the advantage

Kodak, Nokia, and Blockbuster all had moats — until they didn't.

"Wide" vs. "Narrow" Moats

Morningstar popularized this language:

  • Wide moat: advantage expected to persist 20+ years
  • Narrow moat: advantage expected to persist 10+ years
  • No moat: vulnerable to competition

The fewer wide-moat businesses you find, the more reason to hold them when you do.

A Simple Test

Ask yourself: "If I gave a competitor $10 billion and 5 years, could they replicate this business?"

  • If "yes, easily" → no moat
  • If "maybe, partially" → narrow moat
  • If "no chance" → wide moat

Buffett built his fortune on this idea: identify durable, high-return businesses, hold them for decades, and let compounding do the work. Moats are why it works.

Key Terms

Economic Moat — A durable competitive advantage that protects a company's profits from competition.
Return on Invested Capital (ROIC) — How much profit a company generates per dollar of capital invested. Above 15% over many years signals a moat.
Switching Costs — The friction (money, time, risk) of moving from one product or service to a competitor.
Network Effects — A product becomes more valuable as more people use it (e.g., social networks, marketplaces).
Pricing Power — The ability to raise prices without losing many customers. The cleanest sign of a strong moat.

Not financial advice. This lesson is educational content designed for use within Fantasy Stock League. It is not an investment recommendation or a solicitation to buy or sell any security. Always do your own research and consult a licensed financial professional before making real investment decisions.

Sign in to track your progress