Until 1984, American consumers had only one choice for telephone service-"Ma Bell." However, today consumers have many choices for "data" services. Consumers can choose AT&T, Verizon, CenturyLink or relay on Internet service providers like Skype. This increase in the number of service providers indicates an increase in _____.单项选择题
A
competitive intensity
B
consumer inertia
C
market associability
D
consumer disconfirmation
E
selective density
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