It is this second key role that also has forced central bankers to attain an aura of infallibility: after all, if central bankers admit they don't know what they are doing, how can they convince others that "all shall be well." Here, too, one can recall Mario Draghi's vows - which we now know were lies - that the ECB "does not have a Plan B" in case Greece exits the Eurozone, as the mere contemplation of such a worst-case scenario would create the self-fulfilling reality that central bankers are trying to avoid. Another such example is Ben Bernanke's iconic prediction from 2007 that "subprime is contained." Everyone remembers what happened next.