144) Why is the new-task buy situation both a great opportunity and a challenge for a marketer? 145) In what type of purchase would one person most likely assume all or most buying center roles? 146) Explain the buyer center role of the influencer. 147) How does reverse marketing work? 148) Identify an advantage and disadvantage of implementing multiple sourcing. 149) Why might a company use crowdsourcing? 150) Identify two postpurchase evaluation metrics that may be used in the B2B buying