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Chicago Fed Letter, No. 24, August 1989
New! Improved! The MMI Gets a Different Look
Three distinct changes were made to the Midwest Manufacturing Index (MMI) index last month: 1) the base year was moved from 1973 to 1983; 2) the methodology was improved; and 3) a U.S. version of the MMI replaced the Federal Reserve Board's Index of Industrial Production as the national comparative index.

Federal Reserve Bank of Chicago, 230 South LaSalle Street, Chicago, Illinois 60604-1413, USA. Tel. (312) 322-5322

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