Source: Angelica Lieth, TRIANGLE BUSINESS JOURNAL, 7/6/15

A map shows just how big the $18 trillion U.S. economy really is by comparing the gross domestic product of states to the GDP of countries around the world. Mark Perry, an economist and professor at the University of Michigan, created the map published on the American Enterprise Institute's Carpe Diem blog.

For more of this story, click here.