From the summary:
A bursting asset bubble inevitably requires central bank action, usually when it is already too late and with adverse spillover effects. In this sense, the Federal Reserve and other central banks already target asset prices; yet, by taking aim at them only on the way down–as in the current housing and credit crisis–the “Big Banks” create a self-perpetuating cycle of perverse incentives and moral hazard that often gives rise to yet another round of bubbles.
The U.S. central bank’s current premise is that policymakers cannot and should not target asset bubbles. However, the housing story has rendered untenable the prevailing belief that bubbles are impossible to spot ahead of time. The warning signals were ubiquitous–for example, price charts showing home values rising impossibly into the stratosphere, and Wall Street’s increasing reliance on housing-backed bonds for its record-setting profits. It has become abundantly clear that there was plenty the Fed could have done to discourage speculative behavior and put a stop to predatory lending.