def combinedFrictionRate (β_L V T β_C K_eff Tstar β_I G T_min β_S E ξ : ℝ) : ℝ :=
learningFrictionRate β_L V T + cascadeFrictionRate β_C K_eff T Tstar
+ institutionalFrictionRate β_I G T T_min + shockFrictionImpulse β_S E ξResults T-80 through T-89: Endogenous Information Friction Dynamics