theorem shockAmplification_nonneg (e : NSectorEconomy N) (n m : Fin N) :
0 ≤ shockAmplification e n m := by
unfold shockAmplification
exact mul_nonneg (sectorEffectiveCurvature_nonneg e n)
(sectorEffectiveCurvature_nonneg e m)Multiplier-Cycle Duality in a Multi-Sector Economy