To see the U.S. economy in 3D, you gotta hit the open road. 100 years after the iconic highway was built, “Marketplace Morning Report” host David Brancaccio kicks off his final week in the host chair with his journey on Route 66. His trip begins in Santa Monica, California. Along the way, he speaks with local business owners about the precarious job market, changing landscapes, and why one particular stop is a hit with French tourists.