<prompt> Translate the following text to EnglishUtaratibu wa sasa wa muda mrefu wa uchumi wa Marekani kwa ajili ya akiba ya kitaifa na uwekezaji ni chini ya kutokuwa na uhakika wa kina kuhusu mabadiliko ya kiuchumi na majibu ya mabadiliko hayo.  <response>: 4. The current long-term economic outlook for U.S. national saving and investment is subject to wide ranging uncertainty about economic changes and the responses to those changes. 