Final answer:
Direct mail is the least effective way to reach potential sales prospects compared to cold calls and personal visits.
Explanation:
Direct mail is the least effective way to reach a potential sales prospect. While it can be a practical option, it often has a low response rate due to the difficulty in convincing people to complete and return surveys sent via mail.
Cold calls and personal visits are more direct ways to engage with prospects compared to indirect methods like direct mail.
Face-to-face conversations are highlighted as the most efficient method, emphasizing the importance of personal interactions in sales processes.
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