WASHINGTON — Federal Reserve Vice Chair Janet Yellen Thursday said the central bank must continue its aggressive measures to support the economic recovery, citing an unemployment rate that remains far above the Fed's comfort levels and a price stability target that is expected to hover at or below its 2% target for "several years."

In a speech prepared for delivery to the Society of American Business Editors and Writers, Yellen also said she favored adjusting the Fed's program of $85 billion a month in asset purchases as the outlook for the labor market evolved.

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