What are the factors that determine the success of retailing business and specifically the wholesale clubs?

Carefully read the Costco Case Study. This case elaborates Costcos performance analysis. It is through benchmark ratios that we see how Costcos performance compared to that of others in the retail industry, such as Walmart. Observe specifically, how the unique business model of the wholesale club is reflected in their financial statements.

Discuss:

1- Among the list of companies given in the case, work out which business model is similar to Costcos
2- What are the factors that determine the success of retailing business and specifically the wholesale clubs?
3- What are Costcos competitive advantages and what is the key area to watch while going forward?

Note that i DONT want to see a cover page or reference list. Just answer the above three questions completely one by one. This means you write the question and below is the answer completely and accurately.