TPG2017 Chapter I paragraph 1.40

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All methods that apply the arm’s length principle can be tied to the concept that independent enterprises consider the options realistically available to them and in comparing one option to another they consider any differences between the options that would significantly affect their value. For instance, before purchasing a product at a given price, independent enterprises normally would be expected to consider whether they could buy an equivalent product on otherwise comparable terms and conditions but at a lower price from another party. Therefore, as discussed in Chapter II, Part II, the comparable uncontrolled price method compares a controlled transaction to similar uncontrolled transactions to provide a direct estimate of the price the parties would have agreed to had they resorted directly to a market alternative to the controlled transaction. However, the method becomes a less reliable substitute for arm’s length transactions if not all the characteristics of these uncontrolled transactions that significantly affect the price charged between independent enterprises are comparable. Similarly, the resale price and cost plus methods compare the gross profit margin earned in the controlled transaction to gross profit margins earned in similar uncontrolled transactions. The comparison provides an estimate of the gross profit margin one of the parties could have earned had it performed the same functions for independent enterprises and therefore provides an estimate of the payment that party would have demanded, and the other party would have been willing to pay, at arm’s length for performing those functions. Other methods, as discussed in Chapter II, Part III, are based on comparisons of net profit indicators (such as profit margins) between independent and associated enterprises as a means to estimate the profits that one or each of the associated enterprises could have earned had they dealt solely with independent enterprises, and therefore the payment those enterprises would have demanded at arm’s length to compensate them for using their resources in the controlled transaction. Where there are differences between the situations being compared that could materially affect the comparison, comparability adjustments must be made, where possible, to improve the reliability of the comparison. Therefore, in no event can unadjusted industry average returns themselves establish arm’s length prices.

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