Answer — ........B MR =SRMC ( marginal revenue =short run marginal cost)
Explanation:- A unregulated firm attains equilibrium when its MR = SRMC , Marginal revenue refers to additional revenue from an additional unit of output whereas SRMC refers to short run marginal cost. Marginal cost is additional cost which incurs when an additional unit of output is produced.
Incorrect options — SRATC can't eqate AVC ,because its difference AFC can't be zero. At TR=SRTC a firms earn a zero economic profit , TR =AR at only 1st level of output.
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