Federal Reserve Bank of St. Louis
and Bullard, James. "Permazero : Speech : Delivered at the Cato Institute–33rd Annual Monetary Conference, Rethinking Monetary Policy, Washington, D.C." in Statements and Speeches of James Bullard
(November 12, 2015).
https://fraser.stlouisfed.org/title/7161/item/654827/content/pdf/bullard_20151112_speech, accessed on May 13, 2026.