請問一個題目 - 經濟

In which of the following ways is a monopolist different from a perfect

competitor?

(A)average cost will continuously drop as output expands.

(B)price is above marginal cost.

(C)the demand curve for the industry has a negative slope

(D)all of the above are true.




這題我想了很久覺得答案是D吧

(A)獨占廠商不就是享有規模經濟所以平均成本會持續降低(不太確定觀念對不對)

(B)是因為P大於MR所以在MR=MC時P>MC

(C)獨占廠商面對負斜率需求曲線 完競廠商面對水平需求曲線


可是書本上的答案是給B

想請問大家怎麼想的



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