The commercial pipeline is clogged. Every year, this supply chain brings $1 trillion worth of toys, clothing, electronics and furniture from Asia to the United States. And right now, no one knows how to unclog it. Read more:For months, consumers have confronted shortages of goods such as clothing, toys, groceries and cars. And those shortages aren’t going away any time soon. Reporter David J. Lynch visited the shipyards of Southern California – where giant container ships are waiting up to two weeks to unload their berth – and several of the country’s crammed rail yards and warehouses to figure out what’s clogging the global supply chain. If you value the journalism you hear in this podcast, please subscribe to The Washington Post. We have a deal for our listeners – one year of unlimited access to everything The Post publishes for just $29. To sign up, go to washingtonpost.com/subscribe.