<prompt> Translate the following text to EnglishIkiwa huduma ya posta itafanya mabadiliko yote yanayowezekana na masoko yatapatikana kuwa hayawezi kupingwa, itakuwa kwa sababu uchumi wa kiwango na uzalishaji wa pamoja, na faida za kuwa na kampuni ya zamani, ni kubwa kuliko hasara yoyote inayohusiana na viwango vya uzalishaji au mishahara.  <response>: If the Postal Service makes all feasible changes and the markets are found not to be contestable, it will be because the economies of scale and joint production, and the advantages of being an incumbent,10 are larger than any disadvantages associated with the levels of productivity or wages. 