Which type of store carries a deep assortment,has knowledgeable staff,and might actually be viewed as a giant specialty store?

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Category killers are stores that specialize in one specific category (such as electronics, toys, or sporting goods) and carry a deep assortment within that category. They often have knowledgeable staff and are viewed as a giant specialty store because they dominate their category.

Which Type of Store Carries a Deep Assortment,has Knowledgeable Staff,and