The shutdown of global supply chains due to the Covid-19 pandemic brought to the fore an issue with the high level of global economic interdependence: what happens when one country is the main source for an item, say face masks, and then can no longer supply the item? Countries suddenly unable to meet the demand for certain supplies are faced with growing calls for economic nationalism. What are some of the lasting effects that the pandemic could have on global supply chains and trade? How would this affect national security?