Economic moats explained
Warren Buffett looks for businesses surrounded by a moat — a durable advantage that keeps competitors at bay. It's the single most important quality a long-term investor can find, because it's what lets a great company stay great. Here are the main kinds of moat, and how to spot a real one.
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01 Intangible assets
Brands, patents, and regulatory licenses that competitors can't easily copy. A premium brand lets a company charge more for a similar product; a patent or license legally fences off a market.
02 Switching costs
When leaving a product is costly, risky, or just painful, customers stay. Think enterprise software wired into a company's operations, or a bank that holds your direct deposits and bills.
03 Network effect
Each new user makes the product more valuable to every other user. Marketplaces, payment networks, and social platforms get stronger as they grow — and that strength is brutally hard to dislodge.
04 Cost advantage & pricing power
Two sides of the same coin. A structurally lower cost base — from scale, location, process, or unique assets — lets a company undercut rivals and still profit; low-cost producers survive price wars others can't. The flip side is pricing power: a brand strong enough to raise prices without losing customers (Apple, Coca-Cola) earns more from the same sale.
05 Toll bridge
Control of an essential route, resource, or piece of infrastructure that competitors can't practically replicate — a railroad, a pipeline, a regional utility. Building a rival would cost billions and take years, so the incumbent collects the toll. A near-monopoly protected by the sheer cost of getting around it.
06 Efficient scale
A market just big enough for one or a few players to serve profitably. New entrants would only split the pie and ruin the economics for everyone, so they stay away — think pipelines or regional utilities.
How a moat shows up in the numbers
A moat isn't just a story — it leaves a trail in the financials. In a competitive market, high profits attract rivals who compete them away. So when a company keeps earning high returns on invested capital for a decade, something is clearly protecting it. Sustained high ROIC is the clearest numerical fingerprint of a moat.
The story still matters. Always ask the concrete question: what specifically stops a well-funded competitor from taking these customers? A moat you can name and see in the numbers is one you can trust. This is exactly the judgment behind Buffett's screening criteria.
Frequently asked questions
What is an economic moat?
An economic moat is a durable competitive advantage that protects a company's profits from competitors — the business equivalent of a moat around a castle. The term was popularized by Warren Buffett. Companies with wide moats can sustain high returns for years because rivals can't easily erode them.
What are the types of economic moat?
The main sources are intangible assets (brands, patents, licenses), switching costs, the network effect, cost advantage and pricing power, the toll bridge (control of essential infrastructure), and efficient scale. Most strong businesses rely on one or two of these, and the best moats combine several — a brand reinforced by scale, for example.
How do you identify a moat?
Look at the numbers and the story together. In the numbers, a moat shows up as high returns on invested capital sustained over many years — returns that competition hasn't competed away. In the story, ask what specifically stops a well-funded rival from taking the company's customers. If there's no clear answer, there may be no moat.
Can a moat disappear?
Yes. Technology shifts, changing customer habits, deregulation, and new business models all erode moats — newspapers and video rental are cautionary tales. That's why a moat is judged on whether it's widening or narrowing, not just whether it exists today.
Why do moats matter for investors?
Because a moat is what lets a wonderful business stay wonderful. Without one, high profits invite competition that drags returns back to average. A durable moat is what makes long-term compounding — and patient, long-horizon investing — actually work.
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