Trader Joe`s, Harvard Business School »ç·Ê ºÐ¼® ¹× ¹®Á¦Ç®ÀÌ / 1. How do firms in the supermarket industry make money 2. What are the key sources of Trader Joe¡¯s competitive advantage 3. What are the main threats to Trader Joe¡¯s competitive advantage Is there advantage sustainable 4. How would you modify Trader Joe¡¯s strategy moving forward / 1. How ¡¦