* For Correspondence: College of Business, FM 1098 & University Dr., Prairie View, TX 77002. Phone: (936)261-9223. Email: chsheh@pvamu.edu . We thank Praveen Kumar, Tom George, and Craig Pirrong for helpful comments and suggestions. The views expressed herein are solely those of the authors and not those of any other person or entity. Any errors are ours alone. Dealer Competition and Financial Market Performance: An Experimental Analysis Between Monopoly and Duopoly Structures By Chi Sheh * College of Business, Prairie View A&M University Nathaniel Wilcox Economic Science Institute, Chapman University and Department of Economics, University of Houston December 12, 2009