Threat of Substitute products or services:
When considering the substitution factor 2 things has to be differentiated one is that the company replacement and the second is the product substitution. A company replacement means Next substitution for its rivalries. For instance if a customer does not like the Next Jacket color then the customer will purchase the jacket in some other stores which is a competitor to Next Plc. Contrast to product exchange this type of replacement lose earnings. On the other hand substitution of product denotes that the customer’s decision to purchase specific product and then recompense their decision and purchases some other product which is used for their needs. One instance may be that customer does not like the color of Next jacket they may probably purchase the jumper. This leads to redistribution of profit within the organization which is not harming the Next Plc’s success. The improper cardiac output can also be considered as another most important reason for the death. The cardiac output might not be good in both of the couple because of the reduced heart rate and stroke volume. The hot tub water also decreases the blood pressure. So, the death of Mr. and Mrs. Underhill can be caused due to numerous reasons.