Federal Reserve Gives a Nudge To 2 Key Rates
Federal Reserve Chmn Alan Greenspan raises interest rates by quarter of percentage point and signals that further rate increases will probably be needed to keep strong economy from generating inflation; move, fourth rate increase since June, is in line with what most economists and investors expected; financial markets take announcement in stride; central bank, in increasing its benchmark Federal funds target rate on overnight loans among banks by quarter-point to 5.75 percent, pushes rates above where they had been in mid-1998; also raises its discount rate on loans to banks from Federal Reserve system by quarter-point, to 5.25 percent; graph; Greenspan photo (M)