Because of the concentrated distribution of interest rates on outstanding mortgages, modest interest rate declines in 1997 and 1998 made refinancing a smart choice for a record number of homeowners. In addition, the strong economy and the age of mortgage loans likely contributed to the surge in...

The growth of "sweeps"--a banking practice in which depository institutions shift funds out of customer accounts subject to reserve requirements--has reduced the required balances held by banks in their accounts at the Federal Reserve. This development could lead to greater volatility in the...