Oligopoly Year Article Journal or Book Co-author 2000 Comment on ‘A Note on N. Economides: The Incentive for Non-Price Discrimination by an Input Monopolist’ by Mats Bergman International Journal of Industrial Organization None 1999 Quality Choice and Vertical Integration International Journal of Industrial Organization None 1998 The Max-Min-Min Principle of Product Differentiation Journal of Regional Science Asim Ansari and Joel Steckel 1998 The Incentive for Non-Price Discrimination by an Input Monopolist International Journal of Industrial Organization None 1993 Quantity Leadership and Social Inefficiency International Journal of Industrial Organization None 1993 Quality Variations in the Circular Model of Variety-Differentiated Products Regional Science and Urban Economics None 1993 Hotelling’s ‘Main Street’ With More Than Two Competitors Journal of Regional Science None 1993 Differentiated Public Goods: Privatization and Optimality Does Economic Space Matter? Essays in Honour of Melvin L. Greenhut Susan Rose-Ackerman 1992 Competition and Integration Among Complements, and Network Market Structure Journal of Industrial Economics Steven C. Salop 1989 Symmetric Equilibrium Existence and Optimality in Differentiated Products Markets Journal of Economic Theory None 1989 Quality Variations and Maximal Variety Differentiation Regional Science and Urban Economics None 1987 On Nash Equilibrium Existence and Optimality in Oligopolistic Competition in Prices and Varieties Greek Economic Review None 1986 Nash Equilibrium Existence in Duopoly with Products Defined by Two Characteristics Rand Journal of Economics None 1986 Stable Cartels International Economic Review M.P. Donsimoni and H.M. Polemarchakis 1986 Minimal and Maximal Product Differentiation in Hotelling’s Duopoly Economics Letters None 1985 A Note on Equilibrium in Price‑Quality Competition Greek Economic Review None 1984 The Principle of Minimum Differentiation Revisited European Economic Review None 1981 Oligopoly in Markets for Products Differentiated by their Characteristics None