First Author:   William Barnett University of Kansas barnett@ku.edu   Department of Economics, Summerfield Hall, Room 213A, 1300 Sunnyside Avenue Lawrence, 66045-7585, USA   785-864-2844(Phone) 785-864-2844(Fax) http://barnett.wustl.edu Second Author: Shu Wu University of Kansas shuwu@ku.edu   Department of Economics, Summerfield Hall, 1300 Sunnyside Avenue Lawrence, 66045-7585, USA   785-864-2868(Phone) 785-864-5760(Fax) http://www.people.ku.edu/~shuwu