Bertrand duopolists face a market demand curve given by P = 90 - Q where Q is total market demand. Each firm can produce output at a constant marginal cost of 30 per unit. The equilibrium price and quantity for the total market will be
A. Q = 45, P = 45.
B. Q = 30, P = 60.
C. Q = 40, P = 50.
D. Q = 60, P = 30.
Answer: D
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