To grasp the legalese of my initial encounters with the 1968 US transfer pricing regulations (under section 482 published in the Federal Register (33 FR 5848), April 16, 1968), I translated the three specified transfer pricing methods (CUP, resale price and cost plus) into algebra and found a multiplier formula tying them together.
I created a two equation system including an accounting equation and a stochastic equation, and obtained the reduced-form equation to estimate the price (CUP) or the selected gross profit indicator. Using the same multiplier procedure, I developed the CPM/TNMM in 1989.