<prompt> Translate the following text to EnglishKwa kiwango ambacho hutumiwa kupunguza deni la shirikisho lililohifadhiwa na umma, ziada zinawakilisha fursa ya kuongeza akiba ya kitaifa.  <response>: To the extent that they are used to reduce federal debt held by the public, surpluses represent an opportunity to increase national saving. 