<prompt> Translate the following text to EnglishKatika kesi ya sheria iliyofanywa mwishoni mwa miaka ya 1980, kwa ombi la mjumbe wa posta, Tume ilizungumzia suala la mamlaka ya Huduma ya Posta ya kujadili mabadiliko ya viwango katika fomu ya pendekezo la kutambua viwango vya mkataba.  <response>: In a rulemaking proceeding conducted in the late 1980s at the request of a mailer, the Commission addressed the question of the Postal Services authority to negotiate rate changes in the form of a proposal to recognize contract rates. 