CHICAGO--(BUSINESS WIRE)--The Bank of America Chicago Marathon continues to provide year-over-year growth to Chicago’s economy, with the 2014 race delivering an estimated $254 million in total business impact to the city. The findings come from the latest economic impact study reported today by Bank of America. The event remains a key economic driver for the city, providing more than a quarter of a billion dollars to Chicago for the second year in a row. The independent study is conducted by Un


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