AUG · ISSUE 34 · August 20, 2026
CONCEPTWhat a 'moat' is, and why Buffett only buys companies that have one
A good product is not enough. What separates a company that lasts from a passing fad is its ability to defend its profits when the competition arrives.
WHAT IT IS
MOAT
a lasting edge
WHAT FOR
DEFEND
the profits
WHO SEEKS IT
BUFFETT
before buying
THE IDEA
THE MOAT
→ the competitive edge that protects a company's profits
When a business makes a lot of money, it attracts competitors who want a share. The 'moat' is what stops them from taking it: a strong brand, unbeatable costs, a network of users, or a high switching cost. Without a moat, margins erode over time.
THE RULE
SIMPLE RULE20 years
20 years
▲ the horizon a real moat is measured against
A trendy product lasts a season. A real moat keeps defending profits long after everyone has forgotten the launch.
Buffett is not looking for an edge for this quarter: he wants one that still protects profits two decades from now.
- HORIZON
- — The time frame an investment is judged over. The longer it is, the more durability matters.
- DURABILITY
- — An edge's ability to last over time despite competition.
QUOTE
AUTHORITYCastles with moats
“I look for economic castles protected by unbreachable moats. What matters is not today's product, but what stops a rival from copying it tomorrow.”
It is the metaphor one of the greatest investors in history uses to describe what he buys and what he avoids.
- QUALITY
- — An investing style that seeks companies with lasting edges and steady profits.
- COMMODITY
- — An undifferentiated product where only price competes. The opposite of having a moat.
EXAMPLE
NO MOATWhat happens to the margin when there is no moat
A company with a moat would keep the line high. Without one, every rival that enters trims the margin until it is bare. Illustrative curve.
Illustrative curve. Without an edge to protect it, competition erodes a company's margin year after year.
- EROSION
- — The gradual wearing down of an edge or a margin as competitors arrive.
- COMPETITION
- — Other companies trying to take your customers, usually by cutting price.
TYPES
THE 4 SOURCESWhere a moat comes from (the four types)
BRAND AND INTANGIBLES
A trusted brand, a patent, or a license lets a company charge more than a rival for the same thing. People pay for the name.
COST ADVANTAGE
Producing cheaper than anyone, through scale or access to raw materials. You can cut the price until the rival loses money and you do not.
NETWORK EFFECT
The product is worth more the more people use it (payments, social networks, marketplaces). Each new user reinforces the moat by itself.
SWITCHING COST
Changing supplier is expensive or awkward (enterprise software, banks). The customer stays even when something better shows up.
Almost every lasting moat fits one of these four categories. Recognizing them helps you judge a company.
- NETWORK EFFECT
- — When a product gains value as more people use it.
- SWITCHING COST
- — The effort, time, or money it takes to move from one supplier to another.
COMPOSITION
WHERE IT COMES FROMWhat a strong company's moat is made of
A moat built from several sources at once is far harder to storm. Illustrative split, not from a specific company.
Illustrative split. The best companies rarely rely on a single source: they combine several.
- INTANGIBLE
- — An asset with no physical form: brand, patent, license, or reputation.
- SCALE
- — Producing in large volume to lower the cost per unit.
EXAMPLES
WHAT IT LOOKS LIKEFive real-world examples of a moat
| KO | ~68 | → steady | Brand. A century-old formula and name that people ask for out of habit. |
| V | ~330 | → steady | Network effect. The more merchants and users, the more essential its payment network. |
| COST | ~940 | → steady | Scale and costs. It buys so cheaply by volume that competing on its price is brutally hard. |
| ASML | ~900 | → steady | Intangibles. A near-monopoly on the most advanced machines for making chips. |
| MOAT | ~95 | → steady | An ETF bundling wide-moat companies. A way to invest in the whole concept at once. |
Well-known companies, each with a different kind of moat. Approximate prices, this is a teaching example, not a recommendation.
- ETF
- — A listed basket that bundles several companies under one criterion.
- WIDE MOAT
- — A rating for companies whose edge is judged to be very durable.
WRAP
FOLLOW USCan you spot the moat now?
Next time you see a trendy company, ask yourself: what stops others from copying it? That is where the answer lives.
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- MOAT
- — A lasting competitive edge that protects a company's profits.
- QUALITY
- — An investing style focused on companies with solid, durable edges.