# A characterization of the generalized optimal choice set through the optimization of generalized weak utilities

*Athanasios Andrikopoulos* ()

*Theory and Decision*, 2016, vol. 80, issue 4, No 5, 621 pages

**Abstract:**
Abstract It often happens that a binary relation R defined on a topological space $$(X,\tau )$$ ( X , τ ) lacks a continuous utility representation; see, e.g., (Peleg, in Econometrica 38:93–96, 1970, Example 2.1). But under an appropriate choice of a second topology $$\tau ^{*}$$ τ ∗ on $$(X,\tau )$$ ( X , τ ) , the existence of a semicontinuous utility representation on the bitopological space $$(X,\tau ,\tau ^{*})$$ ( X , τ , τ ∗ ) can be ensured (see Remark 1 in the text). On the other hand, the traditional notion of weak utility representation as defined by Peleg (Econometrica 38:93–96, 1970) cannot be used to characterize the generalized optimal choice set, which requires binary relations that allow cycles. The main result in this paper states that for any generalized upper tc-semicontinuous, separable, pairwise spacious and consistent binary relation R defined on a bitopological space $$(X,\tau _1,\tau _2)$$ ( X , τ 1 , τ 2 ) and any subset D of X, there exists a utility function which characterizes the generalized optimal choice set of R in D in terms of the maxima of this function.

**Keywords:** Condorcet winner; Generalized optimal choice set; Weak utility function; Bitopological space (search for similar items in EconPapers)

**Date:** 2016

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**Persistent link:** https://EconPapers.repec.org/RePEc:kap:theord:v:80:y:2016:i:4:d:10.1007_s11238-015-9517-9

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**DOI:** 10.1007/s11238-015-9517-9

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