<prompt> Translate the following text to SwahiliJust about every economic historian who has looked at the issue believes that standard measures of productivity have consistently understated the true improvement in living standards for at least the past 140 years.  <response>: Kama ilivyoelezwa katika makala hii, Mhistoria wa uchumi ambaye ameangalia suala hili anaamini kwamba vipimo vya kawaida vya uzalishaji vimekuwa vikipunguza kuboresha kweli katika viwango vya maisha kwa angalau miaka 140 iliyopita. 