theorem growthRate_pos {g₀ β τ : ℝ} (hg : 0 < g₀) (hbτ : β * τ < 1) : 0 < growthRate g₀ β τ := by simp only [growthRate] exact mul_pos hg (by linarith)
thesis/CESProofs/Macro/GrowthTax.lean:93
Growth and Dynamic Tax Revenue (Layer 4-5 of Macro Extension)