<prompt> Translate the following text to EnglishZaidi ya kiwango cha chini cha uwekezaji unaohitajika kudumisha hisa za mtaji, uwekezaji wa ziada wa kupanua hisa za mtaji ni njia muhimu ya kuongeza uzalishaji wa kazi, na hivyo viwango vya maisha vya baadaye.  <response>: Beyond the minimum level of investment needed to maintain the capital stock, additional investment to expand the capital stock is an important way to increase labor productivity, and thus future living standards. 