First Author:   William Barnett University of Kansas barnett@ku.edu   Department of Economics, University of Kansas, Summerfied Hall, Room 213A Lawrence, 66045-7585, USA   785-864-2844(Phone) 785-864-2844(Fax) http://barnett.wustl.edu Second Author: Stephen Spear Carnegie Mellon University ss1f@andrew.cmu.edu   GSIA, Carnegie Mellon University Pittsburgh, 15213, USA   412-268-8831(Phone) 412-268-7356(Fax) http://littlehurt.gsia.cmu.edu/Spear/home.html