Volcker specifically chides Bernanke and Yellen for their fixation on a two percent inflation target, one of the main ornaments on the data dependent Fed Christmas Tree. “How did central bankers fall into the trap of assigning such weight to tiny changes in a single statistic, with all of its inherent weakness?” he asks. Good question. Volcker writes in Bloomberg. Deflation is a threat posed by a critical breakdown of the financial system.