what will happen to ATC when MC> ATC ?

Dear Student,

The answers given by both the students are correct. When marginal cost becomes greater than average cost, then this implies both average and marginal costs are increasing, but marginal cost is increasing at a higher rate than the average cost.

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When MC>AC, MC increases at a faster rate than AC.
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Relationship between ATC and MC:
  • when MC falls, or MC<ATC, ATC falls. 
  • when MC is zero, or MC=ATC, ATC becomes constant. (at this point, MC amd ATC intersect)
  • when  MC rises, or MC>ATC, ATC rises. 


the point S is the minimum point.

before S, MC<ATC, hence both fall.
after S, MC>ATC, hence both rise.
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