I need 3-400 words for the following questions.
1. How has Dell Used its direct sales and build-to-order model to develop an exceptional supply chain?
2. How has Dell exploited the direct sales model to improve operations performance?
3. What are the main disadvantages of Dell's direct sales model?
4. How does Dell compete with a retailer who already has a stock?
5. How does Dell's supply chain deal with the bullwhip effect?