A Result on Localization of Equilibria |
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Authors: | Bianchi M Pini R |
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Institution: | (1) Istituto di Econometria e Matematica per le Applicazioni Economiche, Finanziarie e Attuariali, Università Cattolica del Sacro Cuore, Milano, Italy;(2) Dipartimento di Metodi Quantitativi per l'Economia, Università di Milano-Bicocca, Milano, Italy |
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Abstract: | In this paper, we deal with a general equilibrium problem where a bimap F: A×B X×Y2
Z
is involved. This problem contains the scalar equilibrium problem as a very special case. The general equilibrium is considered via the properties of the map G: B2
A
naturally associated to the problem. The main result shows that, to have solutions on every convex subsets B
1 of B, localized via a map T: B2
A
, a necessary and sufficient condition is the KKM property of the map G with respect to T. The assumptions require that T satisfies a regularity condition with respect to G, and it is proved that this condition is quite sharp, providing a suitable counterexample. |
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Keywords: | KKM maps equilibrium problems for bimaps proper quasimonotone bimaps |
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