Which of the following is NOT a factor affecting sustainability of a competitive advantage?

Which of the following is NOT a factor affecting sustainability of a competitive advantage?


a. the availability of substitutes for a firm's core competence


b. the rate at which obsolescence of the core competence occurs because of environmental changes


c. the imitability of a core competence


d. the length of time the core competence has existed


Answer: the length of time the core competence has existed


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