<P> The United States is the world 's largest economy with a GDP of approximately $18.56 trillion , notably due to high average incomes , a large population , capital investment , moderate unemployment , high consumer spending , a relatively young population , and technological innovation . Tuvalu is the world 's smallest national economy with a GDP of about $32 million because of its very small population , a lack of natural resources , reliance on foreign aid , negligible capital investment , demographic problems , and low average incomes . </P>
who has the biggest gdp in the world
The United States