WASHINGTON -- Federal Reserve Board Chairman Alan Greenspan could come under pressure from Congress this week to further ease interest rates to counter a recent weakness in money supply growth, which some economists say could thwart the economic recovery.

Since the beginning of the year, the broad measure of the money stock known as M2 has increased at an annual rate of 3.5% -- a rate well below the Fed's target of 4.5% -- creating a shortfall in money growth of about $20 billion, said Robert Brusca, chief economist with Nikko Securities.

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