Question

Mp may be zero or negative, but ap continues to be

Answer 1

Explanation:

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.

Answer 2

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 < Average product. Marginal Product can be zero and negative but Average product is never zero.