The Federal Reserve Bank of Chicago building, the institution that publishes the National Activity Index. Finance Chicago Fed activity index turns positive at 0.07 in September as production rebounds Mono Scoops 2d The Chicago Fed National Activity Index rose to 0.07 in September from a revised minus 0.08 in August, with production contributing 0.13 while consumption and housing dragged, and the three-month average edging up to 0.03. Read Full Story