<prompt> Translate the following text to EnglishViwango hivi vya juu vya faida vinaonekana kupingana na matarajio ya jumla ya wachumi kwamba kuongeza usambazaji wa mtaji hupunguza faida yake na hivyo inaonekana kuonyesha ongezeko la jumla ya uzalishaji wa sababu.  <response>: These high rates of return seem to contradict economists general expectations that increasing the supply of capital reduces its return and thus seems to indicate a rise in total factor productivity. 