Still unclear exactly how QE eases conditions: Fed's Dudley

PHILADELPHIA (Reuters) - Extensive research into massive asset-purchase programs has not yet clarified whether such policies ease financial conditions primarily as a signal to investors or more directly through private portfolios, an influential U.S. central banker said on Saturday.

from Reuters: Business News http://feeds.reuters.com/~r/reuters/businessNews/~3/pVSunqovddU/story01.htm