Planet Money: Of Boats And Boxes

More than a third of the goods that the United States imports comes through the Ports of LA and Long Beach. So what happens when shipping backlogs mean that ships have to idle just outside those ports? And what can be done to solve the problem? <em>Planet Money</em> takes a trip to three ports around the U.S. to investigate what broke the global supply chain and how the ports are working to clear the bottlenecks.