<prompt> Translate the following text to EnglishKulingana na ripoti ya mwaka wa 2015, Memo ya 150 inatoa ufafanuzi wa kamusi ya ruzuku na voucher, ikionyesha kwamba voucher ni wazi mwisho wakati ruzuku si.  <response>: Calling the 150 a cost estimate, the memo provided dictionary definitions of subsidy and voucher, indicating that vouchers are explicitly finite whereas subsidies are not. 