Urgent, please help

(d) [5pts] There is an important distinction between protecting competition and protecting competitors. What the difference and why it is important? (e) [5pts] In our discussion of tacit collusion, we discussed price leadership, and four reasons that price leadership may occur in a market. Describe each of the four types of price leadership. Discuss whether each form of price leadership is used for anti-competitive purposes. (f) [5pts] What is double marginalization? Who benefits and who is hurt by it? In what situations does it occur and when does it not occur