<prompt> Translate the following text to EnglishHata kwa ajili ya mammal kama ATT, uchumi wa kwenda ndani ni karibu na prohibitive, kwa sababu mzunguko wa ndani ni sehemu ghali zaidi ya mfumo mzima kujenga na kuendesha.  <response>: Even for a mammoth like ATandT, the economics of going local are close to prohibitive, because the local loop is the most expensive part of the entire system to build and operate. 