问题
单项选择题
Which of the following most accurately describes the condition that typically exists when marginal product is at a maximum（）
A. Marginal cost is at a minimum.
B.Average product is at a minimum.
C.Average variable cost is increasing.
答案
参考答案：A
解析：
Marginal product is at a maximum when marginal cost is at a minimum. At the corresponding labor and output levels, average variable cost is decreasing and average product is increasing.