Final answer:
A retailer known for large inventory and low prices in a specific category that dominates and outcompetes other retailers is called a category killer.
Step-by-step explanation:
A retailer that carries a large inventory in a single category and offers competitive pricing, making it difficult for customers to refrain from making purchases, is known as a category killer. These retailers often have a well-established reputation for slashing prices to outcompete others and may possess a well-respected brand name built up over many years. Businesses like these benefit from economies of scale, allowing them to undercut competitors and dominate a specific category, often leading to the closure of smaller specialized stores.