Concurrence spatiale et distorsions de localisation en information incomplète
[eng] Spatial competition and distortuns of localization. Under incomplete information. . We study a model of spatial duopoly competition with sequential entry on a segment in the choice of locations (stage 1 of the game) and then simultaneous competition in delivery prices (stage 2). The second mover at stage one has incomplete information on the marginal cost (high or low) of the first mover. Hence, we obtain a signalling game in which there exist naturel constraints on the range of possible signais. The focus of the analysis is the identification and characterization of perfect Bayesian equilibria robust to some refinements criteria (the intuitive criterion and Dl) when the constraints on the signals are tight. The main result is that the separating equilibrium is no longer the only equilibrium surviving the Dl criterion. An important consequence of this resuit is that the robust equilibria become highly sensitive to the prior beliefs of the players. For a given interval of locations, the higher the cost difference between the low type and the high type of first movers, the more often the constraints will be tight. The characterization of the role of these constraints requires a systematic description of ail the equilibria and of their dependence on prior beliefs. [fre] Concurrence spatiale et distorsions de localisation en information incomplète . . La théorie de la concurrence spatiale est essentiellement une théorie de la concurrence en information complète. On se propose de procéder à un premier examen des conséquences d'asymétries d'information sur la localisation des firmes. On considère un duopole dans lequel la concurrence se déroule en deux phases. Au cours d'une première étape, une première firme dont le coût n'est pas connu de la seconde mais qui connaît le 'coût de cette dernière, choisit sa localisation sur un segment de droite. Cette localisation est observée par la seconde firme qui détermine ensuite sa propre localisation sur le même segment. Au c
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