Baltimore Sun Wall Street roller coaster 2018-10-12 - ARTICLE, SPORTS PG 14 RICHARD DREW/AP Specialist John O’Hara works on the floor of the New York Stock Exchange as stocks slumped for a second straight day. The market, which is enduring its most volatile stretch since February, sank by more than 2 percent. The Dow dropped 546 points after dropping 831 points on Wednesday.