完全垄断厂商达到长期均衡的条件是()

完全垄断厂商达到长期均衡的条件是()

A.MR=MC:

B.MR=SMC=LMC

C.MR=SMC=LMC=SAC

D.MR=SMC=LMC=SAC=LAC

正确答案是B

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