Suppose all the firms , in a competitive market , have the following cost-function C(Q)=Q^2+B, where B is some constant.
a. What is the long-run competitive equilibrium price,P*?( P* will be a function of B)
b. If market demand is given by QD(P)=60-P, what value of B will lead there to be only one firm left in the market in the long-run competitive equilibrium( firms are price takers)?