The law of diminishing (marginal) returns states that as more of a variable
factor is added to a certain amount of a fixed factor, beyond some point:
a. Total physical product begins to fall
b. The marginal physical product rises
c. The marginal physical product falls
d. The average physical product falls
factor is added to a certain amount of a fixed factor, beyond some point:
a. Total physical product begins to fall
b. The marginal physical product rises
c. The marginal physical product falls
d. The average physical product falls