In the comment thread here, Kenneth Rufo raises the following with respect to my evocation of conditions of validity:
In the context of this conversation we have the idea of "conditions of validity," which provides a solid catchphrase for exactly the sort of maneuver that must happen for incommensurability to be known as an ontological or existential fact, but of course the exact delineation of those conditions will always be rhetorical. SO questions of disciplinarity, hegemony, boundary-work - in short, all the questions of sociological distinction - serve as the technical operations that divide two (sets of) discourses.
But therein seems to be a tension, because for the incommensurability to be known, either a consensus on that incommensurability is necessary (which does seem to involve a certain paradox), or an act of force or coercion must be undertaken that successfully draws the line that separates the condition of validity from that of invalidity. This latter option makes practical sense, but it seems reliant on extant modalities of power and identification that simultaneously appear (though perhaps "masquerade" is a better word choice) to be the subject of incommensurability rather than the more fundamental condition from which incommensurability is made possible.
Incommensurability need not be accepted or known by all involved (which would of course make it parasitic on a prior commensurability). In fact, the opposite is the case--inscribed into the situation is its own description, about which there is disagreement. So, there isn't an external point of truth or agreement that then allows for incommensurability to appear.
I prefer to talk about the situation with respect to antagonism--or even with respect to the division of the one, as Zizek describes it in Parallax. Put in political terms, society is fundamentally split, and this split appears in its own description--competing or disagreeing elements describe the split differently. They have different ways of accounting for it, situating it, defining it. Some may not even recognize or acknowledge a split at all--and then they might dismiss those who do acknowledge it as recalcitrant troublemakers.
The antagonism of sexual difference also well illustrates the point: there is not one human that is divided into 2 sexes. Nor is there a fundamental way to account for or explain sexual difference (gender, desire, chromosones, genitalia, etc). Instead, we have a difference and then multiple ways of accounting for it, explaining it, dealing with, ways that ultimately want to erase or eliminate the split altogether, perhaps by demonstrating that what we really have is balance, duality.
Swifty (in the same thread) is also skeptical about the term
incommensurability, suggesting perhaps the term political
incommensurability, in part, I think, because he wonders about
incommensurability among those who share a language. I don't think that
differences between languages is central here, first, because I don't
think the matter is one of understanding and, second, because of the gaps and excesses rupturing language.
With regard to the first point, as I mentioned several times in various comments, understanding doesn't tell us very much. That I understand the words coming out of a person's mouth, that I even understand why he says the words he does in the sense that I can reconstruct the conditions that make these words valid, does not mean that I accept these conditions or that I hold them to be operative. So, I may understand why an economist wants to decrease the money supply or increase demand without accepting the larger set of neoliberal economic assumptions informing his advice or recommendations. Similarly, I can know why a theorist argues for cultural rights (to protect the heritage and traditions of a minority group, say) while nonetheless rejecting its premises (that cultures are the sorts of entities that can have rights, that rights are sensical political tools). Or, closer to the worlds I travel in, I can understand when people deny things like the constitutive lack, the imaginary, the symbolic, and the Real, but I think they are mistaken to do so. I may hope that they will see the error of the ways, but more fundamentally, I don't expect them to.
Resolving these issues, moreover, is not a matter of finding the proper facts. It's not that a piece of information is missing that will decide the case. It's more fundamental than that--it's a matter of ways of looking at the world and expressing both the looking and the world--and here I think Kenneth is right to emphasize the importance of rhetoric as it helps formulate these problems as well as ways of grappling with them. I don't think, though, that rhetoric solves them--although it can solve some and create others.
And, this leads to my second point: as we try to express ways of looking at the world, we will never get it completely right. My words will say more and less than what I mean--this is an aspect of language as a set of shifting signifiers and significations, a set that is unfixed, changing, permeated with enjoyment, and embedded in a set of material conditions (not the least of which is the voice). Others' words will also say more or less than what the other means. In arguments, we often pick up on these elements of more and less--much to the outrage of our opponents, who insist that we are misreading or misinterpreting them, that we are refusing to acknowledge what they know to be true. Such arguments then become momentary enactments of the failures of language and irreducibility of incommensurability, we might even say, of the stubborn rock of the Real.
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