The application of the arm’s length principle is based on the notion that independent enterprises will not enter into a transaction if they see an alternative that is clearly more attractive. See paragraphs 9.59-9.64. As discussed there, a consideration of the options realistically available can be relevant to determining arm’s length pricing for an arrangement. It can also be relevant to the question of whether arrangements adopted by associated enterprises differ from those which would have been adopted by independent enterprises behaving in a commercially rational manner. There may be exceptional cases in which arm’s length pricing cannot reliably be determined for the arrangement actually adopted, and it is concluded that the arrangement would not have been adopted in comparable circumstances by independent enterprises behaving in a commercially rational manner (see Section C.4).