<prompt> Translate the following text to SwahiliNegotiated rates-unaccompanied by a change in service conditions that provides cost justification-are a problematical approach to introducing additional flexibility into Postal Service business practices.  <response>: Viwango vya mazungumzo - bila kuongozana na mabadiliko katika hali ya huduma ambayo hutoa uhalali wa gharama - ni mbinu ya shida ya kuanzisha kubadilika zaidi katika mazoea ya biashara ya Huduma ya Posta. 