Uh ... does this mean they don't?

Jan. 4 (Bloomberg)
By Vivien Lou Chen

Federal Reserve Bank of San Francisco President Janet Yellen said the U.S. central bank must have a “timely” plan for ending lending programs created since the start of the global financial crisis.

“Many of the interventions are novel, so no straightforward methods are available to quantify their effectiveness,” Yellen said in remarks prepared for a speech today in San Francisco. “The Fed must ensure that it has an exit strategy to wind down the facilities in a timely and effective way when they are no longer needed.”