Many of you have probably seen Simmons’ article just out in PPA on ideal and non-ideal theory. Simmons defends Rawls’ account of the ideal/non-ideal theory distinction and his paper is a must read. That said, I have been ruminating over a slightly different take on the debate over the nature of the ideal/non-ideal theory distinction and so thought I’d throw an idea out there.
Drawing on John Rawls’ A Theory of Justice many have suggested that the ideal/non-ideal theory distinction is akin to the full/partial compliance distinction. In creating his ideal theory, Rawls assumes that people will comply (almost) perfectly with the requirements of justice. He then uses his original position argument to conclude that his first principle of justice should have priority over his second. Next, Rawls weakens his ideal theory assumptions, adding the constraint that people may not abide by the requirements of justice. He concludes that we should only embrace his general conception of justice in non-ideal theory.
Unfortunately, the canonical examples of ideal and non-ideal theories cannot be fully characterized as full and partial compliance theories respectively. As Simmons and others note, even Rawls says ideal theory requires more than perfect compliance. In creating his ideal theory he assumes, for instance, that the circumstances do not prevent justice from being secured. Furthermore, others have more recently provided ideal and non-ideal theories that are not full and partial compliance theories (respectively). The main thing that distinguishes Allen Buchanan’s and Michael Blake’s non-ideal theories from their ideal theories, for instance, is that their non-ideal theories assume that there will be states and consider what we should do given that we are confined to a statist system. Similarly, the main thing that distinguishes Ronald Dworkin’s non-ideal theory from his ideal theory is that he assumes that people only have different talents and disabilities in his ideal theory. Blake’s, Buchanan’s, and Dworkin’s ideal theories do not require perfect compliance. Assuming that there is something to the ideal/non-ideal theory distinction and these authors are not just using the terms in completely different ways, the ideal/non-ideal theory distinction cannot just be the full/partial compliance distinction.
Reflecting on the many ways people seem to use the terms, one might despair at the thought of trying to unify such disparate ideal and non-ideal theories. In the draft of his book manuscript Michael Blake suggests, for instance, that the ideal/non-ideal theory distinction is not that useful because it can mean many different things. He implores others to be careful to explain just what assumptions they are making in advancing any theory. Perhaps this is part of what drives Simmons and others to argue for one or another of these ways of thinking about the ideal/non-ideal theory distinction.





































































































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