Why the Fax Machine Was Useless in 1843

Robert Bain patented an electric fax machine in 1843, more than thirty years before the telephone. It went nowhere. The reason was simple: a fax machine that no one else owns is a paperweight. Each new buyer in 1843 was paying full price for a device whose value depended on strangers also paying full price. Almost nobody did.

This is the shape every network business runs into. The product gets more valuable as more people use it, which means the early users get the worst deal. Bell Telephone struggled with the same math in the 1880s — the first hundred subscribers in a city had almost no one to call. Metcalfe, designing Ethernet a century later, would put a number on it: a network's value grows roughly with the square of its connected users.

That math is also why incumbents are hard to dislodge. A new social app that's better in every way than Facebook still has to convince your aunt, your high school friends, and the group chat to come along. Switching alone doesn't help you; switching together does. Economists call this the chicken-and-egg problem, and it's why so many platforms launch by faking one side of the network — Reddit's founders famously seeded the site with sock-puppet accounts so the first real users would see activity instead of an empty room.

The useful instinct, then, is to ask of any product: who has to show up before this works for me? If the answer is a lot of strangers, the product is selling a promise it cannot keep alone.