PAPERS AND COMMENTS Presented at the Industrial Organization Society Sessions of the Southern Economic Association's Fifty-Ninth Annual Conference, Orlando, Florida, November 19-21, 1989 and American Economic Association's Hundred and Second Annual Meeting, Atlanta, Georgia, December 28-30, 1989 || MERGERS: SIGNIFICANCE FOR STRUCTURE, PERFORMANCE AND PUBLIC POLICY SESSION COMMENTCharles E. Helppie · Review of Industrial Organization · 1990