Final answer:
It is more worthwhile for a firm to invest in careful screening of job candidates if the screening method can weed out a larger fraction of the less productive candidates among the overall applicant pool.
Step-by-step explanation:
When it comes to investing in careful screening of job candidates, it is more worthwhile for a firm if the screening method can weed out a larger fraction of the less productive candidates among the overall applicant pool. This is because the screening process helps the firm identify and select candidates who are more likely to be productive and contribute to the success of the company. By carefully screening candidates and eliminating less productive individuals, the firm can increase the overall quality of its workforce.