<prompt> Translate the following text to SwahiliSurpluses simulation assumes that only the Social Security surpluses are saved and used to reduce federal debt held by the public.  <response>: Simulation ya ziada inachukua kwamba ziada tu za Usalama wa Jamii huhifadhiwa na kutumiwa kupunguza deni la shirikisho lililohifadhiwa na umma. 