H-1B is a work visa used to employ specialty workers in the U.S. It's often referred to as the highly skilled worker visa, because many H-1B holders work as engineers, scientists, and in the tech industry. In 2018, 199,000 people applied for an H-1B visa. That's way more than the 85,000 slots available every year. But that's also way down from 2017, when 236,000 people applied for the H-1B. That's roughly a 16% drop in applications. Today on The Indicator, we talk with William Kerr, a professor at Harvard Business School, about what that could mean for the U.S. economy.