[請益]完全競爭的問題
完全競爭市場中.某廠商的AC=(Q^2)/3-4Q+20,
若市場價格為40,該廠商的產量為多少?
在一階微分後,MC=Q^2-8Q+20,解出Q=10
但二階微分後,MC=2Q-8,帶入Q=10,MC^=12
為什麼答案是寫d^2π/dQ^2<0
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