(a) Mail volumes sent at rates under a negotiated service agreement or a rate incentive that is not a rate of general applicability are to be included in the calculation of percentage change in rates under Sec. 3010.23 as though they paid the appropriate rates of general applicability. Where it is impractical to identify the rates of general applicability (e.g., because unique rate categories are created for a mailer), the volumes associated with the mail sent under the terms of the negotiated service agreement or the rate incentive that is not a rate of general applicability shall be excluded from the calculation of percentage change in rates.
(b) The Postal Service shall identify and explain all assumptions it makes with respect to the treatment of negotiated service agreements and rate incentives that are not rates of general applicability in the calculation of the percentage change in rates and provide the rationale for its assumptions. [79 FR 33834, June 12, 2014]