The Great Lakes-St. Lawrence Seaway navigation system supports more than 225,000 jobs and generates billions of dollars in income and revenues annually in both the United States and Canada, according to a study released today. The study, “The Economic Impacts of the Great Lakes-St. Lawrence Seaway System 2010,” was commissioned by the maritime industry and government agencies from both countries. It was peer reviewed by both U.S. and Canadian economists. &nbs...