the purpose of the policies are to bring down interest rates in order to superearths bending, -- spur spending in interest- sensitive sectors. and if we are capable of doing that, that will stimulate a favorable dynamic in which jobs are created or spending takes place, and that creates more jobs throughout the economy. i agree, and our programs are intended to remedy the situation of weak demand. on the other hand it is important to monitor financial risks that could be developing as a consequence of programs or low interest rates are even more broadly of developing financial risks in the economy. the federal reserve is devoting substantial resources and effort to monitoring those risks. at this stage i don't see risks of financial stability, though there is limited yield. we don't see a buildup of development at risk that i think at this stage poses a risk. >> some commentators have suggested in addition to full employment the fed should also monitor asset bubbles. do you think it is a feasible job and something the fed should be doing? if so, what should be done about it? >> i thin