understand / seed
Network Effects
When a product becomes more valuable as more people use it
A telephone is useless if you’re the only one who has one. Each additional user makes the network more valuable to everyone already on it. That’s the network effect.
It explains a lot about technology markets that otherwise seem strange. Why does one platform dominate when several alternatives exist? Why is being second often worthless? Why do tech companies grow so fast and get so big?
Metcalfe’s Law proposes that network value grows roughly with the square of its users because the number of potential connections grows rapidly. Real networks do not value every connection equally, but the model shows why an early lead can reinforce itself.
Facebook’s lead over MySpace cannot be reduced to product quality alone. Once a person’s friends were already on one service, moving imposed a social cost. Network effects can entrench an adequate product, though they do not guarantee one permanent winner.
Not all network effects are the same.
Direct effects: more users means more people to call, more people to trade with, more people to play against. The users benefit from each other directly.
Indirect effects: more iPhone users attract more app developers, which attract more users. The benefit flows through a complement.
Two-sided markets: Uber needs both drivers and riders. Each side’s growth benefits the other. Getting one side is useless without the other.
For some network businesses, early growth may be worth more than early profit. Subsidies can help assemble both sides of a market, but only if the resulting network eventually creates durable value rather than expensive activity.
Growth may become easier after enough relevant participants join. There is rarely one clean tipping point; different communities, geographies, and use cases can reach useful density at different times.
Network effects also create fragility. The same feedback loops that drive growth can drive collapse. If enough users leave simultaneously, the network unravels. MySpace’s decline was sudden — each departure made leaving more attractive for those remaining.
This helps explain why platforms increase switching costs. Lock-in protects the business from the same feedback loop running in reverse, while making exit harder for users.