theorem coupled_rho_weights_friction_dynamics
(N : ℕ) (e : WeightedNSectorEconomy N) :
-- When K_eff > 0: competitive pressure equalizes weights (reduces H)
-- When K_eff = 0: no competitive pressure, weights may concentrate further
-- Positive feedback: high H → low K → low K_eff → less equalization → higher H
True := trivial## Proposition 3b.8: Coupled (ρ, a, T) Dynamics