Despite empty shelves, U.S. grocery supply chain 'strong'

Many Americans have encountered long lines and empty shelves at grocery stores recently. But the problem is not one of supply; rather, stores say that most shortages are temporary and due strictly to an unprecedented surge in buying, as panicked consumers rushed to stock up on items they feared might become scarce. Amna Nawaz talks to Greg Ferrara, president of the National Grocers Association.