<prompt> Translate the following text to EnglishKulingana na malengo yao na sifa, mipango ya mkataba ya aina hii imekuwa labelled mikataba viwango, mazungumzo ya mikataba ya huduma, au hivi karibuni, niche uainishaji.  <response>: Depending on their respective objectives and features, contractual arrangements of this kind have been labeled contract rates, negotiated service agreements, or more recently, niche classifications. 