What is disruption theory?
Disruption theory, developed by Clayton Christensen in The Innovator’s Dilemma (1997), explains why well-managed incumbent companies lose to new entrants whose initial products are objectively inferior. The mechanism: incumbents focus on improving products for their most demanding (and profitable) customers; new entrants serve overlooked customers with simpler, cheaper products that eventually improve enough to attract incumbent customers.
The two types of disruption
Christensen distinguishes two patterns. (1) Low-end disruption — new entrant targets customers underserved by incumbents because they pay too little or demand too little. The new entrant offers “good enough” performance at low cost. Example: Kia/Hyundai vs. Toyota/Honda in the 1990s US market. (2) New-market disruption — new entrant creates a market that didn’t exist by serving non-consumers (people who couldn’t access incumbent products at all). Example: PC vs. mainframes — new buyers who couldn’t afford mainframes.
Why incumbents can’t respond
The strategic trap. Incumbents have profitable customers demanding more performance, so internal resource allocation flows toward sustaining innovation. Responding to disruption requires cannibalising profitable existing business — which sophisticated incumbents resist because the disruptor’s market initially looks small, unprofitable, and beneath the incumbent’s premium positioning. By the time the disruptor moves upmarket, incumbents have lost the capability to compete.
Sustaining vs. disruptive innovation
Sustaining innovation improves existing products for existing customers — incumbents typically win sustaining battles because they have resource and relationship advantages. Disruptive innovation creates new product trajectories incumbents systematically underweight. Christensen’s observation: most “disruptions” claimed in tech press are actually sustaining innovations. True disruption is rarer but more transformative.
How startups apply disruption theory
Three practical implications. (1) Look for overlooked customers — customer segments incumbents won’t serve at scale (too small, too cheap, too unprofitable) are disruption opportunities. (2) Build for “good enough” in the early product, not “premium” — disruptors win on accessibility, not feature parity. (3) Plan the upmarket trajectory — disruption is a process, not a moment; the path from low-end to mainstream must be planned.
Türkiye context
Türk markets exhibit clear disruption patterns: budget supermarket chains (BIM, A101) disrupted traditional supermarkets via low-end disruption; local fintechs disrupted bank-only payment processing by serving SMB segments banks underprioritised; e-commerce platforms disrupted physical retail by serving Anatolian non-consumers without department store access. Türk founders identifying overlooked customer segments — particularly in Anatolian cities — find structural disruption opportunities.
Related: Aggregation Theory, JTBD, Crossing the Chasm, Wedge / Beachhead.