What type of retail establishment comprises a series of shops owned by one firm?

A retail establishment that comprises a series of shops owned by one firm is known as a chain. Chains are characterized by multiple locations that operate under the same brand name and are often managed and supplied by a central organization. This structure allows for consistent branding, marketing, and operational procedures across all locations, which can enhance customer loyalty and streamline management.

In contrast to other options, a franchise involves individual owners operating stores under a franchisor's trademark and system, suggesting a different ownership model. A co-operative retail store functions on a member-driven basis, where members own and run the business collectively. A department store typically refers to a large retail outlet that offers a variety of goods organized into departments but does not imply multiple locations under a single ownership structure like a chain does. Therefore, identifying a chain as the type of retail establishment with multiple locations owned by one firm is accurate and reflects the typical organizational structure found in this retail model.