18. list two reasons that timing purchases is important to a business.

Customer perceived urgency: On-line companies, specially, time the purchases made by clients because this create a sense of urgency in the client and make him take the decision to buy faster. This technique is specially used during sales campaigns.  

Improving Services Standards: Again, in On-line businesses it is important to know how much time does it take to a client to find the product wanted and buy it. then the companies timed this period to find better ways to design its web pages that ultimately lead to faster purchases.

c

explanation: