<prompt> Translate the following text to SwahiliRationalizing street delivery cost by decreasing the quality of delivery service can have a profound impact on the postal density and consequently, on delivery cost.  <response>: Kupunguza 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. 