Clayton Christenson model of disruptive innovation

Disruptive innovation is a market entry strategy where a new entrant targets overlooked or overserved segments of a large market with a simpler, cheaper, or more accessible product — one that incumbents dismiss as inferior until it improves enough to capture the mainstream.

The core insight is counterintuitive: the best way to attack a giant is to build something worse. Not worse in every dimension — worse on the metrics the incumbent's best customers care about most. A product that's cheaper, simpler, more convenient, or more accessible to people the incumbent has ignored or priced out. The incumbent looks at your product, compares it to their premium offering, and rationally decides it's not worth responding to. That rational decision is the trap.

Clayton Christensen identified this pattern while studying the disk drive industry in the early 1990s. He noticed that the companies that killed market leaders almost never did so by building a better product for the leader's existing customers. Instead, they entered at the bottom of the market — or created an entirely new market — with products that were objectively inferior on traditional performance metrics but superior on dimensions like price, simplicity, or portability. The 5.25-inch drive was worse than the 8-inch drive for minicomputer manufacturers. But it was perfect for the emerging personal computer market, which the minicomputer companies didn't care about. By the time the smaller drive improved enough to compete in the minicomputer segment, the incumbents had already lost.

The mechanism works because of how large organizations make decisions. Incumbents are optimized to serve their most profitable customers. When a disruptive entrant appears at the low end, the incumbent's rational response is to retreat upmarket — to focus on higher-margin customers and cede the low end. This retreat feels like good strategy in the moment. Margins improve. Revenue per customer increases. But the disruptor keeps improving, and the market it serves keeps growing, until the incumbent has nowhere left to retreat to.

There are two distinct flavors. Low-end disruption targets the least profitable customers of an existing market with a good-enough product at a lower price — think Southwest Airlines offering no-frills flights to price-sensitive travelers that legacy carriers were happy to ignore. New-market disruption creates demand among people who weren't consuming the product at all — think the early personal computer, which didn't steal mainframe customers but created an entirely new category of user. The most powerful disruptions combine both: they start with non-consumers, then improve until they pull customers away from incumbents.