Competitive Moat
A durable competitive advantage that protects a company's market share and profitability from competitors over the long term.
What is Competitive Moat?
A competitive moat (popularized by Warren Buffett, who borrowed the term from medieval castle defense) is a sustainable structural advantage that allows a company to maintain pricing power, market share, and above-average profitability despite competitive pressure. Morningstar, which conducts formal economic moat analysis on public companies, identifies five primary sources: network effects (the product becomes more valuable as more people use it, as with Visa or Meta); switching costs (customers face significant friction in changing providers, as with enterprise software like Salesforce); cost advantages (lower production or distribution costs than rivals, as with Costco or Amazon logistics); intangible assets (patents, brands, regulatory licenses, as with pharmaceutical companies or Coca-Cola); and efficient scale (serving a market too small to profitably support multiple competitors, as with regional utilities). Companies with wide moats tend to generate persistently high returns on invested capital (ROIC) over time.
Example
Visa's network effect moat is self-reinforcing: merchants accept Visa because hundreds of millions of consumers carry it; consumers carry Visa because virtually every merchant accepts it. This two-sided network creates an almost insuperable barrier to entry — even a deep-pocketed new entrant would struggle to simultaneously attract enough merchants and consumers to challenge Visa's scale. The result: Visa earns net margins above 50% and ROIC above 30%, with the moat having held for decades despite competitive challenges.