Final answer:
Mark's final sales pitch to Avery, including a discount, payment terms, and delivery details, marks a crucial phase in the business negotiation process aimed at finalizing the deal.
Step-by-step explanation:
At this point in the negotiation process, Mark has presented Avery with a final sales pitch. The details of this pitch include a 20 percent discount off the list price, a payment term of 45 days, a set delivery date, and the terms of delivery. This suggests that preliminary discussions and bargaining have likely already taken place, and Mark is now making a concerted effort to close the deal by offering these specific incentives, highlighting an important stage in business negotiations where the seller attempts to create a compelling offer that meets both parties' interests.