theorem policyResponse_nonneg {J : ℕ} (hJ : 2 ≤ J) {ρ : ℝ} (hρ : ρ < 1)
{T_new T_old Tstar : ℝ} (hTs : 0 < Tstar) (h : T_new ≤ T_old) :
0 ≤ policyResponse J ρ T_new T_old Tstar := by
simp only [policyResponse]
linarith [bilateral_Keff_decreasing hJ hρ hTs h]Monetary Policy and the Liquidity Trap