How tight is the U.S. labor market? So much that one trucking company is offering $5,000 signing bonuses to lure new drivers. Yet millions of Americans remain out of the workforce -- people who might be candidates for a job that, while tough, takes relatively little training and can't be shipped overseas. What's going on here? Two guests share their theories with co-hosts Scott Lanman and Kate Smith: Scott's uncle, Kenny Hahn, a professional truck driver for almost four decades, and Justin Fox, a Bloomberg View columnist who has written about the industry.