In a workshop draft, An Extension of Intertemporal Ordinal Welfare to Changing Tastes: Economics as Gauge Theory, Pia Malaney and Eric Weinstein recast consumer welfare under changing preferences as a gauge theory: the cardinal utilities compatible with a market form a principal bundle for the group of recardinalizations, market prices select a canonical connection, and welfare is carried across time by parallel translation. They close with two conjectures, and this draft proves both. The first says that parallel translation is the unique extension of ordinal welfare to changing tastes constructible from market data alone: the only comparison satisfying Ordinality, Time Reversal, and Transitivity. Its proof turns on an observational collapse, by which the ordinal motion of preferences cancels out of the observed cost data; the dynamic cost-of-living index that results is the Divisia index of the price path. The second says that any welfare theory built from information beyond the market differs from parallel translation by a generalized torsion, a 1-form valued in the adjoint bundle, and that the correspondence between theories and torsions is a bijection sending parallel translation to zero. The market-data hypothesis of the first conjecture is precisely the vanishing of that torsion.