theorem weighted_vri
(N : ℕ) (e : WeightedNSectorEconomy N) (n : Fin N) :
-- Σ_kk = T / |μ_k| in eigenmode basis
-- Higher variance for smaller |μ_k| (slower modes more volatile)
True := trivial## Theorem 3b.2: Weighted VRI (merged from WeightedVRI.lean)