<prompt> Translate the following text to EnglishKupunguza gharama za utoaji barabarani kwa kupunguza ubora wa huduma ya utoaji inaweza kuwa na athari kubwa kwa wiani wa posta na kwa hivyo, kwa gharama ya utoaji.  <response>: Rationalizing street delivery cost by decreasing the quality of delivery service can have a profound impact on the postal density and consequently, on delivery cost. 