TPG2022 Chapter II paragraph 2.58

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No general rule can be set out that deals with all cases. The various methods for determining costs should be consistent as between the controlled and uncontrolled transactions and consistent over time in relation to particular enterprises. For example, in determining the appropriate cost plus mark up, it may be necessary to take into account whether products can be supplied by various sources at widely differing costs. Associated enterprises may choose to calculate their cost plus basis on a standardised basis. An independent party probably would not accept to pay a higher price resulting from the inefficiency of the other party. On the other hand, if the other party is more efficient than can be expected under normal circumstances, this other party should benefit from that advantage. The associated enterprise may agree in advance which costs would be acceptable as a basis for the cost plus method.