To wrap up this critique, I summarize as follows: If we can identify bubbles quickly and accurately, are reasonably confident that tighter policy would materially check their expansion, and believe that severe market corrections have significant non-linear adverse effects on the economy, then extra action may well be merited.
But if even one of these tough conditions is not met, then extra action would be more likely to lead to worse macroeconomic performance over time than that achievable with conventional policies that deal expeditiously with the effects of the unwinding of the bubbles when they occur.