How does a specialty store differ from a category killer and a discount store?

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 thatcompeting firms find it almost impossible to operate profitably in that industry (or in the same local area). The existence of a category killer eliminates almost all market entities, whether real or virtual. Many existing firms leave the industry, thereby increasing the industry's concentration ratio.

specialty store can carry a diverse range of products. Though Gap specializes in clothing, such clothing could be for children, teens or adults. You might also occasionally find Gap shoes or socks. This is certainly the case with a specialty store like Old Navy, where you can purchase not only clothes for the whole family, but also accessories, dog bowls, Frisbees, and a variety of other non-clothing related items.