Consider a perfectly competitive equilibrium in which each

Question

Consider a perfectly competitive equilibrium in which each firm’s long run total cost curve is TC(Q)=Q^3−2Q^2+10Q. For each of the following, explain why it cannot a long-run perfectly competitive equilibrium

(a) P=14; 20 firms producing 2 units each, Q^D=82−3P

(b) P = 12; 50 firms producing 1 unit each, Q^D=167−P

(c) P = 9;100 firms producing 1 unit each, Q^D=128−2P