The network effect: why some businesses grow on their own

Think about the first telephone in the world. No matter how advanced, it was useless: there was no one to call. With the second phone, you could make one call. With a thousand, a thousand possible conversations. With millions, a network that changed the world. The telephone didn't get better over the years because of its technology, but because each new user made everyone else's phone more valuable. That's called the network effect, and it's one of the most powerful growth engines there is.

The difference from a normal business is enormous. A bakery sells one loaf and then has to go sell the next. A business with a network effect, instead, gets better every time a new customer joins, because that customer makes the service more useful for everyone already there. It grows, in part, on its own.

Metcalfe's law in simple words

Robert Metcalfe, one of the inventors of the technology behind computer networks, proposed an idea that became famous: the value of a network grows with the square of the number of users. It's not linear, it's explosive.

• With 10 users, the approximate value is 10 times 10, which is 100.
• Add one more and it's 11 times 11, which is 121.
• One more and it's 12 times 12, which is 144.

Each new user doesn't add a little: it grows the value of the whole network at once, because it connects to everyone already there. That's the math that explains why big networks are so hard to dethrone.

Why this creates nearly unstoppable businesses

The platforms we use daily live on this. A social network isn't valuable for its colors or its features, but because your friends are there. A ride service like Uber works because there are many drivers and many passengers at the same time, and each side pulls in the other. A messaging app holds you not by its design, but because all your people are already inside.

A network effect can let a product gain utility very quickly, allowing it to build a sustainable competitive advantage.

That's the real jewel. A business with a network effect doesn't just grow faster: it becomes hard to copy. A competitor can clone your features in an afternoon, but it can't clone your millions of users. A study by the firm NFX estimates network effects are behind roughly 70% of the value created by tech companies since the internet began. It's not a detail; it's the engine.

Direct, indirect, and data

Not all network effects are the same. It helps to tell three flavors apart so you can spot them in the real world.

• Direct: each new user raises the value for other users of the same kind. The telephone, WhatsApp.
• Indirect or two-sided: more of one group attracts a different group. More passengers attract more drivers, and the other way around.
• Data: the more the service is used, the more data it generates, and with that data the service gets better for everyone. The recommendations that improve the more you use them.

What a small business can take from this

Let's be honest: your barbershop or your clinic won't turn into Uber. Most small businesses don't have a pure network effect, and that's fine. But you can borrow the logic behind it, which is more reachable than it looks.

A modest version of the network effect for you is reputation and word of mouth. Each happy customer who recommends another makes your business worth a little more without you spending on advertising, just like each new telephone. Building reviews, referrals, and a community of customers who bring each other in is your realistic way to make growth, in part, move on its own.

The takeaway is this: the most unstoppable businesses in the world grow because each new user makes the service more valuable for everyone. You may not build a global network, but you can cultivate the small, powerful version within reach: happy customers who bring in more customers. That wheel, once it spins, is very hard to stop.

Sources

• Techopedia — https://www.techopedia.com/definition/29066/metcalfes-law
• Wikipedia — https://en.wikipedia.org/wiki/Metcalfe's_law
• NFX — https://www.nfx.com/post/network-effects-manual
• International Banker — https://internationalbanker.com/technology/the-importance-of-network-effects/