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Theoretical and Applied Economics
No. 11 / 2008 (528)

The Impossibility of a Paretian Libertarian: a Solution through the Imposition of a Rationality Condition on Individual Preferences on Conjunct Alternatives

Mihai Ungureanu
National School of Political and Administrative Studies, Bucharest

Abstract. In this article I present the Impossibility of a Paretian Libertarian theorem (Sen) and I discuss its significance with regard to the problem of externalities. I introduce two conditions for the selection of an “acceptable” solution for this impossibility result: efficacy for real societies and ideological fidelity. I present Hillinger-Lapham, Gibbard, Blau and Saari solutions and I classify them according to the two conditions mentioned above. I extend the social choice literature by introducing a new solution consisting in a reformulation of the libertarian at the minimal-rational libertarian preferences. In this formulation the only relevant kind of preferences are those that are “minimal-rational libertarian”. This solution satisfies both the efficacity for real societies and the ideological fidelity conditions.

Keywords: externalities; ideological fidelity; social welfare function; social decision function; minimal-rational libertarian preferences.

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