RATE WAR RAGES AMONG BROKERS
rate war rages among stockbrokers, with some fees cut as much as 60%, a mo after end of fixed comms; financial insts warn that trend could lead to demise of some brokerage firms; fee reductions going to major financial insts; Securities Indus Assn pres Edward I O'Brien calls on SEC, insts and brokers to take 'reasoned approach' to commissions; fears deterioration of broker/dealer network and emaciation of its research capability; Robert D McEvers (First Natl Bank of Chicago), Dexter D Earle (Bankers Trust Co), and Harry A Jacobs Jr (Bache & Co Inc) comment; history of abolition of fixed fees (M)