Final answer:
The type of retail establishment least likely to adopt scrambled merchandising is a specialty store because it focuses on a specific category and aims to maintain its brand identity by offering a deep assortment within that category.
Step-by-step explanation:
The type of retail establishment least likely to adopt scrambled merchandising is a specialty store. Scrambled merchandising involves a retailer adding goods and services that may be unrelated to each other or to the store's original business focus. An ATM is not a retail establishment; it is a machine for financial transactions. Drugstores, supermarkets, and convenience markets often carry a wide assortment of products beyond their primary lines, making them more likely to adopt scrambled merchandising to boost sales and attract different customer segments.
A specialty store, on the other hand, focuses on a specific product category and is known for its depth in that particular category. The business strategy of a specialty store usually revolves around providing a high level of expertise and a wide product assortment within that category, which helps to maintain its brand identity. Therefore, adding unrelated product lines might dilute its specialty image and confuse customers. This is in contrast to environments like the Mall of America, which showcases a variety of stores that are part of a monopolistically competitive market, where products are differentiated yet compete with each other.