TPG2017 Chapter VI paragraph 6.171

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There is no single measure for a discount rate that is appropriate for transfer pricing purposes in all instances. Neither taxpayers nor tax administrations should assume that a discount rate that is based on a Weighted Average Cost of Capital (WACC) approach or any other measure should always be used in transfer pricing analyses where determination of appropriate discount rates is important. Instead the specific conditions and risks associated with the facts of a given case and the particular cash flows in question should be evaluated in determining the appropriate discount rate.