Metcalfe’s Law

The foundational network economics principle that the value of a telecommunications network is proportional to the square of the number of its users. With n users, there are n(n-1)/2 possible connections, which grows roughly as n². This creates a positive feedback loop: more users → more value → more users. Metcalfe's Law explains why network businesses exhibit winner-take-most dynamics, why they're worth investing in before profitability, and why network effects create the strongest competitive moats in technology.

When to use it

When evaluating businesses with network properties; when deciding between growth investment and monetization for network products; when analyzing competitive dynamics in platform markets; when assessing the defensibility of competitive moats.

How it can help

Apply Metcalfe's thinking to any product or service with network properties. The key strategic question: does adding one more user make the product more valuable for ALL existing users? If yes, you have network effects and should invest aggressively in growth. If no, you have a regular product and should focus on unit economics. For competing against network incumbents: you can't out-scale them, so compete on a dimension where network size doesn't matter.