About This ArticleOctober 2008
The Chicago Fed National Activity Index was −2.57 in September, down from −1.61 in August.

Index Shows Economic Activity Weakened Further in September
Last Updated: 10/21/08
The Chicago Fed National Activity Index was −2.57 in September, down from −1.61 in August. Most of the index’s decline in September was driven by the steep drop in industrial production, as reflected in the contribution of the production and income category of indicators. However, all four broad categories of indicators made negative contributions to the index in September.