<prompt> Translate the following text to EnglishKwa kuzingatia uchumi mkubwa wa kiwango cha mtoa huduma wa huduma ya jumla na kiasi kidogo cha barua ya mashindano, ni vigumu sana kwa mteja, angalau nchini Marekani, kulipa bei ya chini kuliko mtoa huduma wa sasa Cohen et al.  <response>: Given the huge scale economies of a universal service provider and the limited amount of contestable mail, it is very difficult for an entrant, at least in the U.S., to charge prices lower than an incumbent Cohen et al. 