Federal Reserve Bank of St. Louis. "Media Advisory: St. Louis Fed's Review: Using the Gravity Model to Estimate the Costs of Protection, The Inflation-Output Variability Tradeoff and Price-Level Targets, Eighty Years of Observations on the Adjusted Monetary Base, The Welfare Cost of Inflation," Federal Reserve Bank of St. Louis News Releases (May 19, 1999). https://fraser.stlouisfed.org/title/6265/item/654480, accessed on January 15, 2025.