Network Effects and What a Small Business Can Do With Referrals

A network effect means more users make the product itself better

A network effect is the property that a product or service becomes more valuable as more people use it. The telephone is the standard example. A single phone is useless, and each additional owner makes every phone more useful. Messaging apps and marketplace or booking platforms show the same pattern. Economists, including Michael Katz and Carl Shapiro in the 1980s, studied it under the name "network externalities."

Two questions matter for a small business: does your own product have this property, and are you confusing it with word of mouth?

Two forms

• Direct: more users make the product better for the same kind of user, as with a calling app.
• Indirect (two-sided): two groups, such as sellers and buyers, each gain when the other grows, as in a marketplace.

You may come across "Metcalfe's law," which says a network's value grows with the square of its users. It is a simplification. Value does not always rise in proportion to user count, and adding users who have little connection to one another adds little.

Referrals are not the same as network effects

This is where people most often mix things up. When a customer recommends you to a friend and a new customer arrives, that is an acquisition channel. A network effect means the product itself improves because it has more users.

A tutoring business may grow through recommendations, yet a bigger roster does not make each lesson better. Referrals spread awareness. They do not by themselves raise the value of what you sell.

Keeping the two apart helps you avoid a common mistake: expecting growth "by referral" without building any system to produce it.

What a small business can build

Even without a network effect in the product, you can create something similar in part:

• A place where customers meet: a user community or a small gathering becomes more useful as participants join.
• A growing store of examples: customer questions, answers, and work samples pile up and help newcomers.
• Easy sharing: give deliverables a form customers can share themselves, such as invitation links or shared workspaces.
• A reason to refer: make sure both the person who refers and the person referred benefit.

If you give money or perks for referrals, the promotion has to be disclosed clearly. In Japan, hidden advertising, often called stealth marketing, has been regulated under the Act against Unjustifiable Premiums and Misleading Representations since October 2023. Rules differ by country, so check the ones that apply to you before you design a program.

What you cannot expect

• With few users, a network effect does not kick in. You must deliver value to your first customers on their own.
• If your offering is a self-contained service, such as individual consulting or custom production, more users rarely make it more valuable.
• Referrals do not spread if customers are not satisfied.
• Piling on rewards to boost referral counts can eat your margin.

Starting small

You do not need an elaborate system at the outset. You can begin with a single line in the post-purchase email that offers a note customers can pass to others with the same problem. See whether referrals actually happen and whether the referred customers stay, and only then decide how much effort to invest.

Be careful if your plan puts you in a field where network effects are strong. Starting late against a service that already has a large user base makes it hard to close the gap in numbers. A small business is usually better off narrowing to one area or occupation and building relationships that are personal and visible within that scope.

What to do next

1. Write down whether existing customers gain anything when you add new ones.
2. If the answer is no, treat referrals and word of mouth purely as a channel and design them as one.
3. If you plan to thank customers for referrals, check the disclosure rules that apply and decide how to do it.
4. Try a small place for customers to exchange tips, such as a reply thread or a small meetup.
5. In three months, record how many new customers came through referrals and how many stayed.