Spurred by the Citicorp-Travelers Group merger, investors piled into the bonds of Citicorp, other money-center banks, and brokerage firms last week in anticipation of similar mergers.

The spreads on money-center bonds-the basis point difference between Treasury's yields and corporate bonds-tightened by as much as 3 basis points last week, while brokerage firm debt narrowed by as much as 5, traders said.

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