<prompt> Translate the following text to EnglishUtafiti unaonyesha kwamba kwa kila dola ya ziada ya akiba, labda theluthi moja hutumiwa kuongeza uwekezaji wa nje wa usawa na theluthi mbili hutumiwa kuongeza uwekezaji wa ndani.  <response>: Research suggests that for each additional dollar of saving, perhaps one-third is used to increase net foreign investment and two-thirds is used to increase domestic investment. 