Port workers at East and Gulf Coast terminals steam toward a strike for the first time since 1977

U.S. ports along the East and Gulf Coasts are set to close on Tuesday, with the union representing tens of thousands of dockworkers and an industry group representing port operators and shipping companies at loggerheads over a new labor contract. 

Experts warn that prolonged work stoppage could lead to higher costs on goods around the nation and create shortages ahead of the holiday shopping season. A one-week strike could cost the economy nearly $3.8 billion and increase the cost of consumer goods, according to the Conference Board, which called the situation a "political minefield" given that it comes just ahead of the November presidential election.