Differences in volume.
USP, a United States agricultural exporter, regularly buys transportation services from FSub, its foreign subsidiary, to ship its products from the United States to overseas markets. Although FSub occasionally provides transportation services to URA, an unrelated domestic corporation, URA accounts for only 10% of the gross revenues of FSub, and the remaining 90% of FSub’s gross revenues are attributable to FSub’s transactions with USP. In determining the degree of comparability between FSub’s uncontrolled transaction with URA and its controlled transaction with USP, the difference in volumes involved in the two transactions and the regularity with which these services are provided must be taken into account if such difference would have a material effect on the price charged. Inability to make reliable adjustments for these differences would affect the reliability of the results derived from the uncontrolled transaction as a measure of the arm’s length result.