<prompt> Translate the following text to SwahiliIt has been pointed out by the American co-authors of this paper that a post could rationalize its delivery costs by reducing the frequency of service on unprofitable routes to the point where they become profitable Cohen et al.  <response>: Wanafunzi wa Marekani waliandika katika makala hii kwamba post inaweza kuruhusu gharama zake za utoaji kwa kupunguza mzunguko wa huduma kwenye njia zisizo na faida hadi hatua ambapo zinakuwa faida. 