Supermarkets
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Primarily engage in retailing a general line of food, supermarkets are larger in size (>20,000 sq ft), number of employees, and sales volume {Alwitt, 1997 #3550}. Chain store identification and number of parking spaces (>100) were used to distinguish supermarkets from grocery stores {Hale, 2004 #3377;Sharkey, 2009 #3556}.
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Grocery stores
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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.
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Convenience stores or food marts
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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.
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Mass merchandisers
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Large, general merchandise "value" stores, such as Kmart, Target, and Wal-Mart.
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Dollar stores
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Limited-price general merchandise "value" stores, such as Dollar General or Family Dollar {Hale, 2004 #3377;Leibtag, 2005 #3375}.
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Pharmacies and drug stores
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Pharmacies and drug stores that were part of national chains (e.g., CVS, Walgreens).
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