高階ECON-MSTR-010
In a Cournot duopoly with identical firms facing Hong Kong market demand P = 100 - Q and MC = 20 for each, the total equilibrium output is:
A. 40
B. 53.33✓ 答案
C. 60
D. 80
解說
Each firm's reaction: q = (100 - 20 - q_other)/2 = 40 - 0.5q_other. Symmetric equilibrium: q = 40 - 0.5q → 1.5q = 40 → q = 80/3 ≈ 26.67. Total Q = 160/3 ≈ 53.33.