The Federal Reserve Bank of Chicago’s national activity index declined in August to negative 0.53 from a revised negative 0.11 reading in July, which had originally been reported as zero. That compares with negative 0.56 in August 2009.

The three-month moving average for the index slipped to negative 0.42 in August from a revised July reading of negative 0.27, the Chicago Fed reported Monday. The original July reading was negative 0.17.

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