Macys, Inc., through its subsidiaries, operates approximately 840 department stores in the United States. Its retail stores sell a range of merchandise, including apparel, home furnishings, and housewares. Senior management has decided that Macys needs to tailor merchandise more to local tastes and that the colors, sizes, brands, and types of clothing and other merchandise should be based on the sales patterns in each Macys store. How could information systems help Macys management implement this new strategy? What pieces of data should these systems collect to help management make merchandising decisions that support this strategy? Focus on the following when answering this question: How do Porters competitive forces model, the value chain model, synergies, core competencies, and network economics help companies use information systems for competitive advantage?