Economic Moat
An economic moat is a company's long-lasting competitive advantage that protects its profits and market share from rivals. Common moats are brand power, network effects, switching costs, cost advantages and regulatory protection.
Medieval castles had moats to keep invaders out. Great businesses have something similar: advantages that stop competitors from stealing their customers and profits. Investors who find wide moats can own companies that keep earning high returns for decades. This entry explains the main types of moats, how to spot them and how they erode.
- Category
- Fundamentals and Macroeconomics
- Reading time
- 3 min
- Also called
- Competitive moat, Moat, Durable competitive advantage
- Updated
Economic moats in plain words
An economic moat is a long-term competitive advantage that protects a company's position in its market.1
A company with a strong moat has an advantage that is both strong and sustainable.1
The five common types are brand power, network effects, switching costs, cost advantages and regulatory protection.2
How to assess a moat, step by step
Check returns on capital
High and stable for years. See Return on Equity and Return on Assets.
Check margins
Above peers and steady. See Profit Margins.
Identify the source
Brand, network, switching, cost or regulation.
Test durability
Could a rival copy it in five years?
Watch for erosion
Technology and regulation change.
Pay a sensible price
A moat doesn't justify any valuation. See Margin of Safety.
Worked examples
Example 1 — Returns above the cost of capital
Wide moat signalCompany A earns 25% return on capital for 10 years; its cost of capital is 9%.
| Excess return | 25% − 9% = 16 points |
Sustained excess returns suggest a durable advantage protecting profits.1
Example 2 — Network effect
Value grows faster than usersA payment network with 10 million users adds 1 million more.
| Possible connections before | ≈ 10m² ÷ 2 = 50 trillion |
| After | ≈ 11m² ÷ 2 = 60.5 trillion |
Each new user makes the network more valuable for everyone — a classic moat.2
Example 3 — A moat erodes
Moat breachedA firm's margins fall from 30% to 12% over five years as cheaper rivals arrive.
| Margin drop | −18 points |
When an advantage isn't sustainable, competition pulls profits back down. See Profit Margins.
Types of economic moats
| Aspect | How it protects | Example |
|---|---|---|
| Brand power | Customers pay more | Premium consumer brands |
| Network effects | More users, more value | Marketplaces, payment networks |
| Switching costs | Hard to leave | Enterprise software |
| Cost advantage | Cheaper to produce | Scale manufacturers |
How investors use moat analysis
Long-term investing
Owning durable compounders. See Time Horizon.
Valuation
Longer high-growth periods in models. See Discounted Cash Flow.
Risk assessment
Weak moats mean fragile profits.
Quality screens
Combining moats with value. See Growth vs Value Stocks.
Advantages and disadvantages
Advantages
- Focuses on durable businesses.
- Helps judge long-term profitability.
- Useful across industries.
Disadvantages
- Subjective to judge.
- Moats can erode quickly.
- Wide-moat stocks are often expensive.
Going deeper
Read as far as you need. Each level builds on the one before it.
Where the name comes from
Beginner
The term comes from the moats around medieval castles that protected the valuables inside.1
Regulatory moats
Intermediate
Licences, patents and regulation can protect incumbents, though rules can change.2
Moats and valuation
Advanced
A wide moat justifies a longer period of above-average returns in valuation, but only up to the price you pay. See Margin of Safety.
Common mistakes
Confusing size with a moat
Big isn't the same as protected.
Ignoring disruption
Technology can bypass moats.
Overpaying
A great business can be a poor investment at a high price.
Relying on one good year
Moats show over long periods.
Check your understanding
Test yourself before moving on. Each answer comes with an explanation.
Key points to remember
- An economic moat is a durable competitive advantage.
- Types: brand, network effects, switching costs, cost, regulation.
- Sustained high returns are a key sign.
- Moats can erode.
- Price still matters.
Frequently asked questions
Who popularised the term?
Can a small company have a moat?
How long does a moat last?
Further learning
- Margin of Safety
Paying the right price for quality.
- Return on Equity and Return on Assets
Measuring the moat's effect.
- Profit Margins
Where moats show up.
- Blue-Chip Stocks
Often wide-moat companies.
Sources
This article is written in our own words. The sources below support the specific facts, rules and figures marked with a number in the text. Links open the original publisher’s page.
- Corporate Finance Institute. Economic Moat (opens in a new tab) Checked .
- Corporate Finance Institute. Corporate Finance Explained: Economic Moats (opens in a new tab) Checked .
Educational content, not financial advice. Examples use hypothetical prices and simplified costs; actual fees, margin rules and regulations vary by broker, market and country. We are not affiliated with any publisher linked above. Last reviewed . Report an error or request a source credit.