MARK W. FRANKENA is Senior Economist with Economists Incorporated, where he has been employed since 1988. Between 1982 and 1988, Dr. Frankena was employed by the U.S. Federal Trade Commission, Bureau of Economics, where he supervised antitrust analysis.BRUCE M. OWEN has been President of Economists Incorporated since 1981 and Visiting Professor of Economics at Stanford University's Washington, D.C., campus since 1989. He was Chief Economist of the Antitrust Division of the U.S. Department of Justice from 1979 through 1981. Prior to this, Dr. Owen was a faculty member at Duke and Stanford Universities.