This episode's headline: Black Boycott. The guests include BENJAMIN HOOKS, National Association for the Advancement of Colored People; Rev. JESSE JACKSON, Operation PUSH; WALTER WILLIAMS, Economist; BILL KELLEHER, U.S. Chamber of Commerce. Byline: In New York: ROBERT MacNEIL, Executive Editor; In Washington: JIM LEHRER, Associate Editor; JOE QUINLAN, Producer; NANCY NICHOLS, Reporter