A category killer is a retailer that specializes in a deep product assortment and a selection process, pricing and market penetration of a competitive competitive advantage over other retailers . Chains Such As Barnes & Noble , Best Buy , and Staples are regarded category killers. 
- Jump up^ Lal, Rajiv; Alvarez, Jose B (October 10, 2011). “Retailing Revolution: Category Killers on the Brink” . Working Knowledge . Harvard Business School . Retrieved 16 November 2016 .