<prompt> Translate the following text to EnglishNjia moja ya kuanzisha ushindani katika mifumo ya posta, bila kuathiri wajibu wa huduma ya ulimwengu, ni kupitia kile ambacho kimeitwa punguzo la kushiriki kazi.  <response>: One method of introducing competition into postal systems, without affecting the universal service obligation, is through what have been termed worksharing discounts. 