external In the Media December 6, 2021 John Rosen, adjunct professor of economics, comments that artificial Christmas trees may be in short supply as most are produced in China and shipping and offloading at U.S. ports is backlogged. https://www.washingtonexaminer.com/policy/economy/christmas-tree-shortages-threaten-holiday-celebrations john-rosen news-all news-in-the-media year-2021 month-december name-john-rosen