On The Univocity of Rawls’s Difference Principle

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Boyer Alain

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Journal: Journal of Philosophical Investigations in Scopus Year:2023 | Volume:17 | Issue:45 Page(s): 60-71

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Title

On The Univocity of Rawls’s Difference Principle

Author(s)

Boyer Alain | Issue Writer Certificate

Keywords

utilitarianism

maximin

leximin

difference principle

Abstract

A double ambiguity has been charged against Rawls’s difference principle (DP). Is it maximin, leximin, or something else? Usually, following A. Sen, scholars identify DP with the so-called leximin. One argues here that one has to distinguish 1° the leximin, 2° the maximin (as rule of justice formally analogous to the maximin rule of decision), represented by the figure in L of the perfectly substitutable goods, and 3° the genuine DP. When the augmentation of inequality benefits the worse off, only Pareto-strong improvements are permitted. leximin would also permit Pareto-weak improvements too (after the first maximum D), where only the richest improves: from (2, 3) to (2, 5), say. This is forbidden by DP. With two classes, unlike maximin, DP has no curve of indifference and is always decisive, as leximin is. For undecisive Rules of Justice, which admit indifferent curves, I propose to add a lexically secondary rule, to break ties. That move is able to clarify the links and the differences between on the one hand maximin alone, with its typical indifference curves in L, and on the other hand, the DP properly understood and the leximin, which both have no indifferent curves. With two classes of persons (best off/worse off), DP appears more egalitarian than leximin, because it's secondary rule is MinIn (Minimization of Inequality). But the intuition behind the distinction is that it cannot possible “fair” that only the best off improves in a productive social cooperation.

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