According to Montgomery and Porter (2009), the only way to sustain a competitive advantage is to upgrade it.
That is, to move to more sophisticated types. With that saying and building on all the above four views, the
measure for Sustainable Competitive can be devised with four major dimensions. They are (1) Effective Supply
Chain Management (2) Product differentiation and Innovation, (3) Organizational responsiveness; and (4) Cost
Leadership. Figure 1 depicts the information on how SCA was operationalized