Answer :
When marginal product (MP) is less than the average product (AP), it means that the additional output produced by each additional unit of labor is less than the average output produced by all units of labor. This leads to a decrease in the average product. Therefore, the correct answer is (b) AP falls.
Example of when marginal product (MP) is less than AP
To better understand this, consider the following scenario: If a company produces 100 units of output using 10 units of labor, the AP would be 10 units per worker.
If they add an 11th worker and produce 110 units of output, the MP of the 11th worker would be 10 units per worker. However, this is less than the AP of 10 units per worker, so the overall average product would decrease.
In summary, when MP is less than AP, it indicates that the additional output produced by each additional unit of labor is less than the average output produced by all units of labor, leading to a decrease in AP.
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