MP can be negative but not AP. comment

Dear student, 

MP can be negative when with an addition to the units of variable factor does not bring about any increase in the production.
On the other hand, Average Product is calculated as the ratio of Total Product and variable units. Neither of the two can be zero. So, average product cannot be zero. 

 

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Average Product increases as long as Marginal Product (MP) > Average Product (AP). Alternatively, when MP > AP, AP rises. Average Product is maximum and constant when Average Product (AP) = Marginal Product (MP). Alternatively, when AP = MP, AP is maximum. Average Product falls when Marginal Product

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