Which factor is least likely to affect a salesperson's workload?

The factor that is least likely to affect a salesperson's workload is the mode of sales compensation. While compensation structures can influence a salesperson's motivation and performance, they do not directly dictate the volume of work or the tasks that are required of the salesperson in their day-to-day activities.

In contrast, the size of the territory can significantly impact workload, as a larger territory may require more travel and time management to cover all clients effectively. The number of products sold also plays a critical role in determining the workload, as more products typically necessitate more product knowledge, sales presentations, and follow-ups. Moreover, the frequency of customer visits directly correlates with how often a salesperson needs to engage with clients, which can increase the workload based on the number of appointments and follow-ups scheduled.

Thus, while the mode of sales compensation may influence behavior and outcomes, it is not a direct factor impacting the actual workload in the way the other options do.