This episode's headline: Ups and Downs; A Golden Anniversary?; Affirmative Action. The guests include LAWRENCE LINDSEY, Federal Reserve Board Governor; SANDRA SHABER, Economic Forecaster; DAVID GORDON, Economist; DAVID MUNRO, Economic Forecaster; WARD CONNERLY, California Board of Regents; WILLIE BROWN, Speaker, California Assembly; CORRESPONDENTS: SPENCER MICHELS; PAUL SOLMAN; JEFFREY KAYE; ELIZABETH FARNSWORTH. Byline: In New York: ROBERT MAC NEIL; In Washington: JAMES LEHRER