<prompt> Translate the following text to EnglishHakuna sehemu ya utoaji gharama za taasisi ni kuchukuliwa kuwa kiasi variable, hata hivyo, kwa sababu muundo njia kwa ujumla haina kubadilika kama kiasi drops.  <response>: No portion of delivery institutional costs is considered to be volume variable, however, because route structure generally does not change as volume drops. 