Federal Reserve Bank of Chicago. Research Department and Federal Reserve Bank of Chicago. "Tracking by the North Star, No. 38," Chicago Fed Letter (October 1990). https://fraser.stlouisfed.org/title/5287/item/535772, accessed on May 11, 2024.
Federal Reserve Bank of Chicago. Research Department and Federal Reserve Bank of Chicago. "Tracking by the North Star, No. 38," Chicago Fed Letter (October 1990). https://fraser.stlouisfed.org/title/5287/item/535772, accessed on May 11, 2024.