(a) No proposal to adjust a rate may set a workshare discount that would exceed the cost avoided by the Postal Service for not providing the applicable service, unless at least one of the following reasons provided in paragraphs (b) through (e) of this section applies.

(b) The proposed workshare discount is associated with a new postal service, a change to an existing postal service, or a new workshare initiative.

(c) The proposed workshare discount is a minimum of 20 percent less than the existing workshare discount.

(d) The proposed workshare discount is set in accordance with a Commission order issued pursuant to § 3030.286.

(e) The proposed workshare discount is provided in connection with a subclass of mail, consisting exclusively of mail matter of educational, cultural, scientific, or informational value (39 U.S.C. 3622(e)(2)(C)) and is in compliance with § 3030.285(c).