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QualityMoat

What is an Economic Moat?

Economic Moat is Warren Buffett's term for a durable competitive advantage that protects a company's profits from competitors. A wide moat allows a business to earn above-average returns on capital for an extended period. The five main moat sources are cost advantage, switching costs, network effects, intangible assets (brands, patents, licenses), and efficient scale.

How to Identify a Moat

No single formula -- identified through sustained ROIC > WACC over a full business cycle

Why Economic Moats Matter to Investors

A business without a moat is a commodity. Competitors will erode its margins until returns fall to the cost of capital. Moated companies, by contrast, can reinvest profits at high rates for years -- the compounding engine that turns ordinary businesses into extraordinary long-term investments. Buffett famously said he would rather buy a wonderful company at a fair price than a fair company at a wonderful price, and the "wonderful company" criterion almost always means a wide moat.

From a quantitative standpoint, look for ROIC consistently above 15% across multiple economic cycles, stable or expanding gross margins, and limited need to cut prices to defend market share. Qualitatively, ask: what would it cost a well-funded competitor to replicate this business in five years? If the answer is "a lot" or "almost impossible," you have found a moat.

Measure the Moat with ROIC

Sustained high ROIC is the clearest quantitative sign of an economic moat. Use our free ROIC Calculator to test any company.

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Frequently Asked Questions

What is an economic moat?+
An economic moat is a sustainable competitive advantage that shields a company's market share and profitability from rivals -- just as a water-filled moat protects a castle. Warren Buffett popularized the term to describe businesses that can earn above-average returns on capital decade after decade without being competed away.
What are the types of economic moats?+
Morningstar identifies five moat sources: (1) Cost Advantage -- producing goods or services at lower cost than rivals; (2) Switching Costs -- the friction customers face when leaving (think enterprise software); (3) Network Effects -- the product becomes more valuable as more people use it (Visa, MSFT Office); (4) Intangible Assets -- brands, patents, or regulatory licenses that block competition; (5) Efficient Scale -- a niche market is optimally served by one or two players, limiting new entrants.
How do you measure an economic moat?+
The clearest quantitative signal is sustained Return on Invested Capital (ROIC) above the Weighted Average Cost of Capital (WACC) over a full business cycle (7-10 years). If ROIC consistently exceeds WACC, the company is creating economic value and likely has a moat. Gross margin stability and pricing power under inflation are secondary indicators.
What companies have the widest moats?+
Classic wide-moat examples include Visa and Mastercard (network effects + switching costs), Coca-Cola (brand intangible asset), Microsoft (switching costs + network effects), and LVMH (brand intangibles). Morningstar publishes a formal moat rating (Wide, Narrow, None) for thousands of publicly traded companies.

Related Terms

Return on Equity

Profitability on shareholders equity

Enterprise Value

Total acquisition cost of a company

Earnings Per Share

Net income divided by shares outstanding

Net Present Value

Discounted value of future cash flows

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