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Category killer is a term used in marketing and strategic management to describe a product, service, brand, or company that has such a distinct sustainable competitive advantage that competing firms find it almost impossible to operate profitably in that industry. The existence of a category killer will eliminate almost all market entity, whether real or virtual. Many existing firms will leave the industry, thereby increasing the industry's concentration ratio.
An examples of a category killer includes high-feature cell-phones. The constant rise in features on cell-phones during the late 1990s and 2000s began including capabilities like mp3 player, PDA, and pocket gaming eliminating the need for users to buy other devices with those function.