<prompt> Translate the following text to EnglishKwa sababu kipimo kikuu cha uzalishaji wa uchumi wa taifa ni pato la ndani la jumla GDP, akiba mara nyingi huonyeshwa kama asilimia ya GDP.  <response>: 4 Because the primary measure of the nations economic output is gross domestic product GDP, saving is often shown as a percent of GDP. 