单选题
Assume that output increased from 1550 to 1850 units per day as a
result of increasing labor from 200 to 210 workers. The marginal product of
labor is closest to:
A. 1.55 units per day per worker.
B. 30 units per day per worker.
C. 1.25 units per day per worker.
【正确答案】
B
【答案解析】Marginal product is the additional output per additional unit of an input (labor). Since output changed by 300 units and labor changed by 10 workers, the marginal product is 300/10=30 units per day per worker.