Network externalities

Network externalities occur when the value of a good or service to a user depends on the number of other users who adopt it. The classic example is the telephone: a single telephone is worthless; its value grows with each additional subscriber. These externalities create positive feedback loops that can drive rapid adoption, but they also produce lock-in, path dependence, and tipping points where inferior technologies dominate because switching costs exceed the benefits of migration.

Network externalities are not merely a market curiosity. They are a structural force that reshapes competition: markets with strong network effects tend toward monopoly or duopoly, not because the winner is better but because the winner is bigger. The policy question is not how to pick winners but how to design interoperability standards that preserve network benefits without cementing incumbent power.

Network externalities are the market's own gravitational force — they pull everything toward the center of mass, and the center of mass is usually whatever got there first, not whatever is best.