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The strategic Marshallian cross

Dickson, Alex and Hartley, Roger (2008) The strategic Marshallian cross. Games and Economic Behavior, 64 (2). pp. 514-532. ISSN 0899-8256

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We prove existence and uniqueness of non-autarkic equilibria in bilateral oligopoly assuming only that preferences are binormal and satisfy a weakened version of gross substitutes. We permit complete heterogeneity of preferences and our analysis exploits the fact that payoffs depend only on own strategy and two universal aggregates. This allows us to define strategic versions of supply and demand curves such that non-autarkic Nash equilibria are in 1-1 correspondence with intersections of these curves. The same approach can be used to establish comparative statics under the assumptions above. As examples, we focus on adding players and changing endowments. This competitive approach also allows us to conclude that much of conventional Marshallian analysis is robust to strategic manipulation.. Strategic Marshallian cross Strategic manipulation Imperfect competition