Given the market demand and supply schedules in a perfectly competitive market:
Q(d) = 50 - 4P and Q(s) = -6 + 3P and given the total cost function for the firm:
C= 20 + 12Q - 4Q^2 + .5Q^3
a) Determine the profit maximizing output and amount of profits for the firm.
b) Check second order conditions.
c) If the market demand increases to Q(d) = 57 - 4P, determine the new profit maximizing output and profits.
d) Check second order conditions.
e) Explain whether this model represent a short run or long run time horizon.