3-1. Explain the relationship of value and cost according to the Porter model. When does it make sense to add cost to a business process? (P.P) 3-2. Suppose you are told that the business process in Figure 3-15 has a negative margin. Explain what that means. Suppose the margin of some business process is a negathe SI million. If costs are reduced by $2.2 million, will the margin necessarily be posithe Explain w or why not. (PP)