Parity, incomparability and rationally justified choice

Philosophical Studies 146 (1):75 - 92 (2009)
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This article discusses the possibility of a rationally justified choice between two options neither of which is better than the other while they are not equally good either (‘3NT’). Joseph Raz regards such options as incomparable and argues that reason cannot guide the choice between them. Ruth Chang, by contrast, tries to show that many cases of putative incomparability are instead cases of parity—a fourth value relation of comparability, in addition to the three standard value relations ‘better than’, ‘worse than’ and ‘equally good as’. It follows, she argues, that many choice situations in which rationally justified choice seems precluded are in fact situations within the reach of practical reason. This article has three aims: (1) it challenges Chang’s argument for the possibility of parity; (2) it demonstrates that, even if parity would exist, its problematic implications for practical reason would not differ from those of Raz’s incomparability; (3) it discusses the underlying cause of hard cases of comparison: the fact that none of the three standard value relations applies (‘3NT’). It will be shown that the problematic implications for the rational justification of the choice are due to 3NT itself, irrespective of whether 3NT is explained as incomparability or parity.

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Martijn Boot
University of Groningen

Citations of this work

Hard cases of comparison.Michael Messerli & Kevin Reuter - 2017 - Philosophical Studies 174 (9):2227-2250.
Parity, Preference and Puzzlement.Joshua Gert - 2015 - Theoria 81 (3):249-271.
Problems of Incommensurability.Martijn Boot - 2017 - Social Theory and Practice 43 (2):313-342.
The Impotence of the Value Pump.John Halstead - 2015 - Utilitas 27 (2):195-216.

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References found in this work

Reasons and Persons.Derek Parfit - 1984 - Oxford, GB: Oxford University Press.
Mortal questions.Thomas Nagel - 1979 - New York: Cambridge University Press.
The Morality of Freedom.Joseph Raz - 1986 - Oxford, GB: Oxford University Press.
Reasons and Persons.Joseph Margolis - 1986 - Philosophy and Phenomenological Research 47 (2):311-327.

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