State the behavior of Marginal Physical Product, under Returns to a Factor.
i. MPP Initially rises to its maximum
ii MPP then decreases (stays positive) to become zero
iii MPP becomes negative
Giving reasons, state whether the following statements are true or false: (i) Average product will increase only when marginal product increases. (ii) Under diminishing returns to a factor, total product continues to increase until marginal product reaches zero.