Final answer:
Walmart accounts for about two-thirds of full-line discount store retail sales in the U.S., standing out among other retailers like Target, Macy's, and Costco (a).
Step-by-step explanation:
The firm that accounts for approximately two-thirds of full-line discount store retail sales in the United States is Walmart. Walmart has established itself as a retail giant, vastly outpacing competitors like Target, Macy's, and Costco in this sector. The history of retail has seen significant transformations since the era of mail-order houses and marketing, highlighting the growing consumer culture shaped by companies such as the Great Atlantic and Pacific Tea Company, Woolworth's, and Sears which expanded consumer access via catalogs.
The firm that accounts for approximately two-thirds of full-line discount store retail sales in the US is Walmart. Walmart is a multinational retail corporation that operates a chain of hypermarkets, discount department stores, and grocery stores. It is known for its low prices and wide range of products.