The Odds Behind the Veil: Manuel Sá Valente's Ex-Ante Equal-Odds Premise as Rawls's MSA-Dependency Made Actuarially Precise, and Why Retreating to Ex-Ante Fairness Does Not Rescue It From the Biological Zero-Day Mechanism

The Suppressed Axiom's Section III.1 shows that Rawlsian contractualism's original position depends on an undeclared premise it never isolates: that agents behind the veil of ignorance do not need to bargain over differential biological duration, because duration was never, for the whole span of recorded history, a distributable social good the way income or office is. Manuel Sá Valente's published research programme on age-group and longevity justice, developed independently within the same Rawlsian tradition and noted only briefly, in passing, as a case of independent convergence with the Mortality Symmetry Axiom in this corpus's The Evaluative Step Not Taken, supplies the sharpest available test of that dependency's reach, because Valente states the premise explicitly rather than leaving it undeclared: distributive fairness across a life, on his account, rests on the claim that, ex ante, everyone faces the same odds of living through any given age, so that an early death is not a worse outcome than a late one before longevity's own cards are dealt. This paper asks whether Valente's ex-ante, actuarial restatement of the premise survives the Biological Zero-Day Mechanism in a way Rawls's own undeclared version, per Section III.1, does not — and finds that it does not, for a reason more precise than family resemblance to Rawls's dependency. The reason is structural rather than rhetorical. Mortality Symmetry Axiom, as The Suppressed Axiom defines it, is a claim about a realized historical distribution — bounded, diffuse, opaque to attribution. Valente's premise is a claim about an ex-ante probability distribution, structurally continuous with how Rawls's veil already treats every other primary good. The two are related but not identical, and this paper argues the relation is closer than it first appears: MSA's historical truth is precisely what let duration go unmodeled as a bargainable good in Rawlsian theory in the first place, because if realized lifespan variance is bounded, diffuse, and opaque regardless of position, there is nothing of consequence for a rational agent to bargain over, and position-independent ex-ante odds follow without needing to be modeled by design. Once BZM reclassifies a category of death from diffuse and opaque to discrete and purchasable, retreating to the ex-ante frame does not restore the premise, because an ex-ante model that never had to price duration as a function of purchasing power does not acquire a correct model of that function merely by continuing to reason ex ante about everything else — the same undischarged obligation Section III.1 finds in Rawls, now inherited by an apparatus built specifically, and more consequentially, around the shape of a life. This paper maintains, throughout, the boundary The Evaluative Step Not Taken states and treats this analysis as the direct test case that paper flags as available for Valente specifically. It does not assert that storable pensions, libertirement, age-sensitive taxation, or basic-income redistribution across a life are fair, unfair, or should be adopted or abandoned. It asserts only that the premise these proposals share requires a defense their published form does not yet supply — the same claim, and no more than the same claim, Section III.1 already makes about Rawls.