This episode's headline: Crisis Summit; Another Boom?; Sharing the Burden. The guests include MICHAEL BESCHLOSS, Historian; DIMITRI SIMES, Soviet Affairs Analyst; MARK KATZ, Soviet Affairs Analyst; VITALY KOROTICH, Journalist; SEN. SAM NUNN, Chairman, Armed Services Committee; CORRESPONDENTS: LINDSAY TAYLOR; BETTY ANNE BOWSER; ESSAYIST: ROGER ROSENBLATT. Byline: In New York: ROBERT MacNeil; In Washington: JAMES LEHRER