Geodesic
Mappings with gross substitutability in the theory of economic equilibrium
Itogi Nauki i Tekhniki. Seriya Sovremennye Problemy Matematiki. Noveishie Dostizheniya, Tome 19 (1982), pp. 111-154.

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A survey of the results relating to the application of gross substitutability in economic equilibrium theory. The topics considered include existence and uniqueness of equilibrium, comparative statics, coalition stability, and stability of price-adjustment tatonnement processes. The main theorems cover the case of multivalued demand satisfying the gross substitutability condition and, in particular, are applicable to linear exchange models. 
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     author = {V. M. Polterovich and A. V. Spivak},
     title = {Mappings with gross substitutability in the theory of economic equilibrium},
     journal = {Itogi Nauki i Tekhniki. Seriya Sovremennye Problemy Matematiki. Noveishie Dostizheniya},
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     volume = {19},
     year = {1982},
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V. M. Polterovich; A. V. Spivak. Mappings with gross substitutability in the theory of economic equilibrium. Itogi Nauki i Tekhniki. Seriya Sovremennye Problemy Matematiki. Noveishie Dostizheniya, Tome 19 (1982), pp. 111-154. http://geodesic.mathdoc.fr/item/INTD_1982_19_a3/