Economic Moats: Protecting Profits

What makes a company's advantage durable, from brands and network effects to switching costs and cost advantages, using Warren Buffett's famous metaphor.

In a competitive market, high profits attract rivals, who compete them away. So how do some companies earn high profits for decades? The investor Warren Buffett popularised the idea of an economic moat: a durable advantage that protects a business, just as a moat protects a castle.

Types of moats

Intangible assets: strong brands, patents and licences. A trusted brand lets a company charge more; a patent blocks copies.
Network effects: a product becomes more valuable as more people use it, such as payment networks or social platforms. New rivals struggle to attract users.
Switching costs: when it is costly or inconvenient for customers to switch, such as changing banking software or enterprise systems, customers stay.
Cost advantages: unique access to cheap resources, efficient processes or scale that rivals cannot match.
Efficient scale: in some markets, such as a pipeline or an airport, there is room for only one or a few firms profitably, deterring entry.

Why moats matter

For companies: strategy should build and strengthen moats, not just chase short-term sales.
For investors: companies with wide moats may be worth more because profits are more durable.

Moats can erode

Technology and regulation can drain moats. Newspapers had strong local advantages until the internet. Film camera makers lost their moats with digital photography. Companies must keep reinforcing their advantages.

Moats and society

Wide moats can also mean market power, allowing firms to raise prices or reduce quality. Competition authorities watch firms whose moats come from anti-competitive behaviour rather than from serving customers well.

The payments habit

Once a payment app is used by nearly all shops and friends in a city, a new app finds it hard to compete. Shops do not want to add another QR code, and users do not want to move. This network effect acts as a moat, though in India's UPI system, interoperability limits how deep any one app's moat can be.

Thinking a great product is always a moat

A great product can be copied. A moat is something that makes an advantage hard to copy for a long time.

Key takeaways

An economic moat is a durable advantage that protects profits.
Moats include brands, patents, network effects, switching costs, cost advantages and efficient scale.
Technology and regulation can erode moats.
Wide moats can also raise concerns about market power.