Network Effect

First mentioned: 2007· 1 mentions

Definition

A product or service becomes more valuable as more people use it, creating a self-reinforcing competitive advantage that newcomers cannot easily replicate.

Network Effect

A network effect occurs when a product or service becomes more valuable as more people use it. This creates a self-reinforcing competitive advantage that is extremely difficult for competitors to replicate.

Buffett's Cautious View

Buffett is more measured about network effects than many investors. While acknowledging their power, he notes this is more Charlie Munger's domain of expertise. His favorite businesses tend to rely more on intangible assets and cost advantages than pure network effects.

Examples

Classic network effect businesses:

Credit card networks (Visa, Mastercard)
Operating systems (Microsoft, Apple)
Social networks

Key Indicator

A business has genuine network effects when:

Each new user makes the product more valuable for existing users
The value proposition is dramatically different with 1M vs. 10M users
Competitors cannot simply "copy" the network

Related Concepts

economic moat competitive advantage

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Mentions in Letters

2007·Network effects as a source of moat

“Some businesses benefit from network effects—the more users they have, the more valuable they become. This creates a powerful barrier to entry.”