Question 4
 This is about a dominated oligopolistic market. Consider a dominant firm D with large market share and three fringe firms F with small market share. Dominant firm D is the price setter and three fringe firms F are price followers in the market. Market demand is Q(P)=10,000-P and the supply of three fringe firms is Q(P)=P-6,000.

Question 3
 Consider a duopoly market. Firm's cost is C(q_i)= 0.28qi；and Q(P)=1,000-1,000P. Answer the following questions.