What Is an Economic Moat? The 5 Types Explained

Warren Buffett popularized the term “economic moat,” and it has become one of the most important ideas in value investing. A moat is what keeps a great business great — the thing that stops competitors from stealing its profits. Understanding moats is the difference between owning a business that compounds for decades and one that gets eaten alive.

Definition: what is an economic moat?

An economic moat is a durable competitive advantage that allows a company to maintain high returns on capital and fend off competition over a long period. Just as a moat around a medieval castle keeps attackers out, an economic moat keeps rivals from eroding a company’s profitability. The wider and deeper the moat, the longer the business can earn above-average returns.

Crucially, a moat must be durable. A hot product or a temporary cost advantage is not a moat if a competitor can copy it next year. Real moats are structural.

The 5 types of economic moats

1. Network effects

The product becomes more valuable as more people use it. Visa and Mastercard are the classic example: every merchant accepts them because every cardholder has them, and every cardholder wants them because every merchant accepts them. This two-sided, global network is almost impossible for a newcomer to replicate.

2. Intangible assets

Brands, patents, and regulatory licenses that competitors legally cannot copy. A strong brand lets a company charge more for an essentially similar product. Patents protect profits for years; licenses create legal barriers to entry.

3. Switching costs

When it is expensive, risky, or simply annoying for customers to leave, a company has a switching-cost moat. Enterprise software is the textbook case: once a company runs its operations on a platform, ripping it out means retraining staff, migrating data, and risking downtime.

4. Cost advantages

Some companies can produce or deliver at a structurally lower cost than anyone else — through scale, proprietary processes, or unique access to resources. This lets them undercut rivals on price while still earning healthy margins.

5. Efficient scale

In markets that only profitably support one or a few players, incumbents enjoy a moat because it makes no sense for a competitor to enter. Think of a pipeline or a regional utility — building a second one would destroy returns for everyone, so nobody does.

Wide moat vs. narrow moat

Not all moats are equal. A wide moat business can defend its advantage for a decade or more — these are the rare compounders. A narrow moat business has an edge today but a less certain future. The width of the moat directly affects how much you should pay.

Moats can strengthen or erode

A moat is not permanent. The key question is not just “does this company have a moat?” but “is that moat widening or narrowing?” Watch the numbers: if revenue, margins, and returns on capital are holding up against competitors, the moat is likely intact. If they are slipping, the moat may be eroding — even for a famous brand.

How to measure a moat objectively

Stories about moats are easy to tell and easy to get wrong. The discipline is to back the story with math. Moatly scores a company’s moat using the Big Five growth metrics — revenue, earnings, equity, operating cash, and free cash flow — compounded across 1, 3, 5, 7, and 10-year windows.