What? They Never Heard Of WorldCom?
Gretchen Morgenson column on cautious position on stocks taken by Richard Bernstein, chief US strategist at Merrill Lynch, who believes quality of corporation earnings is poor and getting poorer; Bernstein view is based on widening gap between between earnings that Standard & Poor's 500 companies have reported under generally accepted accounting principles and operating earnings, figures companies typically employ in press releases after excluding write-offs and other unusual items (M)