The darker side of interest rate cuts

Markets like the Fed cuts and expect more. But lower interest rates could keep the dollar weak and ultimately threaten economic growth.

Interest rates are headed lower. But how low can they go?

The Federal Reserve surprised Wall Street earlier this week by cutting its fed funds short-term interest rate target by three-quarters of a percentage point, to 3.5 percent. The move had the effect of reducing rates on mortgages and home equity loans, and reassured investors that the Fed will do what it can to spur economic activity as long as the threat of recession looms.

But as much as Fed Chairman Ben Bernanke might like to keep the economy rolling by slashing interest rates, it's not clear how much room he'll have to do so. Two factors complicate the outlook for further interest-rate cuts: the hefty losses in the financial sector that are making banks less eager to lend money, and the prospect that lower rates will chase overseas investors away from the dollar, lowering the value of the greenback and boosting inflation. Adding to the case against deep rate cuts is the widespread perception that it was the Fed's rate-cutting zealousness after the last recession that led to the housing bubble that now threatens to derail the economy.

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