Airlines sometimes offer reduced rates during certain times of the week to members of a businessperson’s family if they accompany him or her on trips. How does the concept of relevant costs enter into the decision by the airline to offer reduced rates of

 Airlines sometimes offer reduced rates during certain times of the week to members of a businessperson’s family if they accompany him or her on trips. How does the concept of relevant costs enter into the decision by the airline to offer reduced rates of this type? 

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