Please answer the attached questions on HBR Case Trader Joe's - Please refrain from copying answers from google. Its not that many and dont want to have the same answers as other students. Thanks.

1. How do firms in the supermarket industry make money? Illustrate the competitive strategies of the main companies in the supermarket industry to help support your answer. 2. What are the key sources of Trader Joes competitive advantage? How do these sources support its competitive strategy? 3. Porter (1996) tells the essence of strategy is choosing what not to do. How would use the Trader Joes case to illustrate this point? 4. What are the main threats to Trader Joes competitive advantage? Is their advantage sustainable?