I got a growth strategy case in an interview and I'm not clear what is the best way to quantify the impact. The prompt is to grow an insurance company by 5 times. After drilling down the case, the interviewer agreed that we can expand the sales force by 2 times.
To assess the impact of growing the sales force 2 times, should I directly assume that the productivity per sales can stay the same as the existing sales force, and conclude that we could grow the total revenue by 2 times due to this initiative? What would be a practical way to assess the impact while not “oversimplifying” assumptions?