<prompt> Translate the following text to EnglishWanauchumi wa kisasa wa Keynesian waliandaa angalau barua ya tini ya nadharia kwa mawazo ya Keynesian zaidi au chini, na kwa maneno ya vitendo msingi wa kiakili wa sera ya kisasa ya fedha na fedha ya Marekani ni sawa na kile kilichokuwa tayari katika vitabu vya miaka 20 iliyopita.  <response>: So-called new Keynesian economists provided at least a theoretical fig leaf for more or less Keynesian ideas, and in practical terms the intellectual basis of modern U.S. monetary and fiscal policy is pretty much what was already in the textbooks 20 years ago. 