Final answer:
A supercenter is a retail format that combines the features of a discount store with those of a grocery store, offering a wide range of products for one-stop shopping. Therefore, the most appropriate option is 3.
Step-by-step explanation:
The retail format being described is known as a supercenter. Supercenters offer a vast range of products, fusing the traditional discount store with a full-scale supermarket to provide customers with the convenience of one-stop shopping. They often carry 80,000 to 100,000 products across various categories including dairy, meats, produce, bread, cereals and more. Major grocery stores in the United States, organized into departments for easy navigation, serve as the grocery component of a supercenter. These retail giants can offer economies of scale, which in part contributes to their popularity and success, similar to how Amazon has capitalized on economies of scale with its highly computerized and efficient warehouse system. Small retailers often struggle to compete with supercenters due to their vast selection, convenience, and price-savings benefits to consumers.