The Jones Act, created to protect U.S. shipping interests from competition, has the effect of driving up costs for any good delivered from one American port to another. In particular, consumers in places that are not accessible by land – such as island possessions of the United States – must pay more for basic goods. The Jones Act has been in the news again as of late, as Puerto Rico, devastated by a hurricane, attempts to rebuild and to get its citizens the essentials they need. The Trump Administration issued the U.S. territory a waiver from the Act. This NPR Planet Money podcast explores where the act came from, what it does, and its ramifications for consumers.