(A) Functional comparability. The degree of comparability between an uncontrolled transaction and a controlled transaction is determined by applying the comparability provisions of 1.482-1(d). A reseller's gross profit provides compensation for the performance of resale functions related to the product or products under review, including an operating profit in return for the reseller's investment of capital and the assumption of risks. Therefore, although all of the factors described in 1.482-1(d)(3) must be considered, comparability under this method is particularly dependent on similarity of functions performed, risks borne, and contractual terms, or adjustments to account for the effects of any such differences. If possible, appropriate gross profit margins should be derived from comparable uncontrolled purchases and resales of the reseller involved in the controlled sale, because similar characteristics are more likely to be found among different resales of property made by the same reseller than among sales made by other resellers. In the absence of comparable uncontrolled transactions involving the same reseller, an appropriate gross profit margin may be derived from comparable uncontrolled transactions of other resellers.