Several industries have taken steps to prepare for a likely work stoppage, but analysts say a prolonged walkout could dent the U.S. economy.

U.S. ports from Maine to Texas could shut down Tuesday if a union representing about 45,000 dockworkers carries through with a threatened strike. A lengthy shutdown could raise prices on goods around the country and potentially cause shortages and price increases at big and small retailers alike as the holiday shopping season — along with a tight presidential election —