theorem curvature_conservation_lag (e : TwoWorldEconomy N) (n : Fin N)
(hr : 0 < sectorRelaxRate e.toNSectorEconomy n) :
-- The lag is bounded by the quantity relaxation time
0 < quantityRelaxTime e n hr :=
quantityRelaxTime_pos e n hrTemporal Ordering Rules from Two-World Timescale Separation