Which of the following statements is true in the context of consumer loyalty? a. a consumer with a strong economic orientation displays higher customer share with all competitors. b. a customer's contribution on the equity side of the equation remains the same irrespective of whether or not a customer is a truly committed or acting on inertia alone. c. the certainty of a lengthy stream of revenues is much more for a customer acting only on inertia. d. a firm that concentrates on repeated behavior alone, perhaps by always being convenient, can do well but remains vulnerable to competitors.