<prompt> Translate the following text to EnglishKwa hivyo, kugeuzwa kwa kulipa bili kwa barua kwa njia nyingine za kulipa bili kuna athari zaidi kwa kipande kimoja kuliko barua ya darasa la kwanza.  <response>: Thus, the diversion of bill-paying by mail to other methods of bill-paying is having more impact on single-piece than presort First-Class Mail. 