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Answer to Question #41379 in Microeconomics for Ash

Question #41379
A monopolist can produce at constant average and marginal costs of AC = MC = 9.The firm faces a demand curve given by: q = 75 –– p

Q: What output would be produced by this industry under perfect competition? Show that PM > PC and QC = 2QM.
Expert's answer
AC = MC = 9, q = 75 – p
a. The profit‐maximizing quantity can be found in the point where MR = MC, and the price we can find from the demand curve:
MR = TR' = (p*q)' = (75q - q^2)' = 75 - 2q
MR = MC = 75 - 2q = 9
2q = 66
q = 33 units
p = 75 - 33 = $42
Monopolist’s profit = (p - AC)*q = (42 - 9)*33 = $1089

b. Under perfect competition monopolist will produce output in the point, where demand equals marginal cost:
p = MC = $9
q = 75 - 9 = 66 units
So, PM > PC and QC = 66 = 2QM.

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