Business & strategy laws · law 015
Metcalfe's Law
By Shivam Bhandari · Reviewed 31 October 2026 · How we write
what it means
The value of a network grows roughly with the square of its number of users — each new member adds value for everyone already there.
How Metcalfe's Law works
A phone network with two users has one connection; with ten users it has 45. Communication platforms, marketplaces, and communities become more useful as they grow, which is why network businesses chase scale early.
Real networks rarely grow value exactly by n² — many connections are low-value — but the core insight holds: networks have increasing returns to size.
where it comes from
Proposed by Robert Metcalfe, co-inventor of Ethernet, around 1980 to sell the value of connected devices. Writer George Gilder named it Metcalfe's law in 1993.
Metcalfe's Law examples in business
Messaging
WhatsApp is valuable because everyone you know is on it; a better app with no users is worthless.
B2B marketplaces
A wholesale platform becomes more attractive to buyers with every new supplier, and vice versa.
Communities
A business owners' association becomes more valuable to join as membership grows.
How to apply it
- 1Ask whether your product gets better for each user as more users join.
- 2If yes, prioritise growth of the network over short-term profit per user.
- 3Seed one side of the network first (often supply) in a small geography.
- 4Measure engagement between members, not just member count.
common misreading
Not every business is a network business. Adding customers to a restaurant does not make the food better for each of them.
ask yourself
Does your product become more valuable to each customer as you add more customers?
put it into practice
Frequently asked questions
What is Metcalfe's Law?
The value of a network grows roughly with the square of its number of users — each new member adds value for everyone already there. A phone network with two users has one connection; with ten users it has 45. Communication platforms, marketplaces, and communities become more useful as they grow, which is why network businesses chase scale early.
Who came up with Metcalfe's Law?
Proposed by Robert Metcalfe, co-inventor of Ethernet, around 1980 to sell the value of connected devices. Writer George Gilder named it Metcalfe's law in 1993.
How do you apply Metcalfe's Law in business?
1. Ask whether your product gets better for each user as more users join. 2. If yes, prioritise growth of the network over short-term profit per user. 3. Seed one side of the network first (often supply) in a small geography. 4. Measure engagement between members, not just member count.
What is a common misunderstanding of Metcalfe's Law?
Not every business is a network business. Adding customers to a restaurant does not make the food better for each of them.