Of the five industry forces presented in the chapter (Porter’s model = Traditional rivals within your industry, Threat of new entrants into your market, Customers' bargaining power, Suppliers' bargaining power, Threat of sub????????????????????????????statute products from other industries), which is the most significant for an organization in terms of making IS (information systems) investment decisions? Why? Which is the least significant? Why?
Please cite at least 1 source which supports your answer.