1. U.S ($17. 5 trillion):
The United States is known to be the world’s largest national economy which represents to about 22% of the nominal GDP calculated globally (PPP). The United States GDP was calculated to about $17.5 trillion ranking on the first position in the year 2017.
The forefront of the world economy is in a very crucial economic state which gives birth to latest opportunities for the countries and the continents those who are on the lookout. It ensures the growing population that rolls over the next decades.