Supercenters or superstores
Very large stores that primarily engage in retailing a general line of groceries in combination with general lines of new merchandise, such as apparel, furniture, and appliances (e.g., Super Wal-Mart, Super Kmart).
Primarily engage in retailing a general line of food, supermarkets are larger in size (>20,000 sq ft), number of employees, and sales volume . Chain store identification and number of parking spaces (>100) were used to distinguish supermarkets from grocery stores [65, 108].
Primarily engage in retailing a general line of food, grocery stores are smaller in size, not identified as a chain store and have fewer than 100 parking spaces.
Convenience stores or food marts
Primarily engage in retailing a limited line of goods that generally includes milk, bread, soda, and snacks. The convenience store category also included convenience stores with gasoline and gasoline stations with convenience stores.
Large, general merchandise "value" stores, such as Kmart, Target, and Wal-Mart.
Pharmacies and drug stores
Pharmacies and drug stores that were part of national chains (e.g., CVS, Walgreens).