First Author:   Dionysius Glycopantis Department of Economics, City University d.glycopantis@city.ac.uk   City University, City University, Northampton Square London, EC1V 0HB, UK       Second Author: Charalambos D. Aliprantis Department of Economics, Purdue University aliprantis@mgmt.purdue.edu   Department of Economics, Purdue University, 100 S Grant Street, West Lafayette. , IN 47907-2056, USA       Third Author: Allan Muir Department of Mathematics, City University a.muir@city.ac.uk   Department of Mathematics, City University, Northampton Square London, EC1V 0HB, UK