How can Costco form a sustainable competitive advantage for the future of the retail industry

Answer following question(3-5 sentences each ) 1.How can Costco form a sustainable competitive advantage for the future of the retail industry? 2.How does Costco increase value to consumers by seeking opportunities in the external environment? 3.Would you recommend Costco add gas stations to the warehouses that do not currently have them? If so why? 4.What would you consider to be one of Costco’s biggest opportunities in the E-Commerce realm? : 5.Does Costco’s average store size (145,000) square feet have a negative or positive affect on whether or not they are able to expand internationally? How so? 6.What are some ways Costco could increase their online sales (3% in the last year)? 7.Is Costco targeting the right consumers by focusing only on affluent neighborhoods or should they remarket themselves to the lower class consumers as well? Why? 8.Seeing that Costco is competing in the same market with Sam’s Club and BJ’s, what is their dynamic capability or unique factor that separates them from those other companies?