The sales department of any type of business is often the most important cog in the larger machine. Consider, sales people are responsible for searching out potential partners, fostering existing relationships, and bringing income into the company. To say that sales reps are important to business is much like saying water is good for life; it is a complete understatement.
Alternatively, hiring sales people that lack the ambition, know-how, and other required characteristics of an effective sales representative can set businesses up for failure. Most do not realize it, but hiring sales reps who are bad for the company can cost businesses many times the salary of a single sales representative. If companies want to find employees who fit into a job