<prompt> Translate the following text to EnglishMakadirio haya pia yanaonyesha kuwa kuongeza akiba ya kitaifa ya Marekani haitasababisha kupungua kwa kiasi kikubwa kwa mapato ya mtaji na kwa hivyo inaweza kutoa uboreshaji mkubwa kwa mapato ya baadaye na matumizi.  <response>: These estimates also suggest that increasing U.S. national saving would not substantially decrease the return to capital and therefore could provide significant improvement to future incomes and consumption. 