Economic moat
An economic moat is a durable competitive advantage that protects a business from rivals, the way a moat protects a castle. Warren Buffett’s term for what lets a company sustain high returns over time without being competed away.
How it works
Ask what stops competitors from copying a business and taking its profits. Real moats are structural — network effects, switching costs, scale, brand, patents, or low-cost production — not just a good product, which rivals can imitate.
A moat isn't a feature you have; it's a question you must keep answering as the world changes.
How to use it
- Evaluating whether a business can sustain its profits or will see them competed away.
- Distinguishing durable advantages (structural moats) from temporary ones (a hot product).
- As a builder, designing a moat rather than relying on being merely first or best.
Worked example
Coca-Cola’s formula is replicable, but its brand, distribution, and shelf-space dominance are not — a new cola can match the taste and still fail. That brand-and-distribution moat is why Coke has earned high returns for over a century.
Where it fails
Moats erode — technology and shifting tastes have drowned many "unassailable" castles (newspapers, Kodak, Blockbuster). Assuming a moat is permanent is how incumbents die; the question is not "does it have a moat?" but "is the moat widening or narrowing?"
- A protected position breeds complacency, and the returns a moat guards often fund the slowness that lets a rival catch up.
- Moats are far easier to name in hindsight than to identify forward, so today's confident moat may be tomorrow's cautionary tale.
- A moat protects margins within a market but can trap a firm defending a business that is itself shrinking.
The counter-model: Creative destruction — Creative destruction is the force that drowns castles, reminding you that the relevant question is whether the moat is widening or already being bypassed.
How to apply it, step by step
- Name the specific advantage that keeps rivals from competing the returns away.
- Ask what would have to change in technology or tastes to neutralise it.
- Judge whether that advantage is widening or narrowing year over year.
- Watch for a rival redefining the market so the moat protects the wrong thing.
- Decide whether to reinvest in the moat or to move before it erodes.
The deeper point
The most important word in "durable competitive advantage" is durable — almost every business has some edge, but few have one that survives a decade of competitors attacking it. A moat isn’t a feature you have; it’s a question you must keep answering as the world changes.
Frequently asked
- What is an economic moat?
- It’s a durable competitive advantage that protects a business from rivals — Warren Buffett’s metaphor for what lets a company sustain high returns over time without being competed away.
- What are examples of economic moats?
- Network effects (more users add value), high switching costs, economies of scale, strong brands, patents, and structural low-cost production. These are hard for competitors to copy, unlike a merely good product.
- Do moats last forever?
- No — they erode. Technology shifts and changing tastes have destroyed many once-dominant businesses. The key question isn’t whether a moat exists but whether it’s widening or narrowing over time.
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Cite this page
ReadGlobe. (2026). Economic moat. https://readglobe.com/model/moat/
"Economic moat." ReadGlobe, 29 May 2026, readglobe.com/model/moat/.
Primary source: Wikipedia
Editorial synthesis © ReadGlobe 2026, drawing on the mental-models tradition (Charlie Munger, Farnam Street) and the primary sources for each model. · Last reviewed 2026-05-29.