The regular demand curve a monopoly faces is Qx= 65 – 1/2Px
The firm's cost curve is C (Q) = 10 + 6Q
What is the profit-maximizing solution?
Answer : Given,
Demand : Q = 65 - 1/2 P
=> 1/2 P = 65 - Q
=> P = (65 - Q) * 2
=> P = 130 - 2Q
TR (Total Revenue) = P * Q = (130 - 2Q) * Q
=> TR = 130Q - 2Q^2
MR (Marginal Revenue) = TR / Q
=> MR = 130 - 4Q
Given, C(Q) = 10 + 6Q
MC (Marginal Cost) = C(Q) / Q
=> MC = 6
At monopoly equilibrium, MR = MC.
=> 130 - 4Q = 6
=> 130 - 6 = 4Q
=> 124 = 4Q
=> Q = 124 / 4
=> Q = 31
Now, P = 130 - 2Q = 130 - (2 * 31) = 130 - 62
=> P = $68
Therefore, the monopoly firm's profit maximizing price is, P = $68 and quantity is, Q = 31 units.
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