theorem npv_solow_level_only {B₀ η D₀ τ : ℝ} : npvRevenue B₀ η D₀ 0 τ = lafferRevenue B₀ η τ / D₀ := npv_no_dynamic_equals_static
thesis/CESProofs/Macro/GrowthTax.lean:253
Growth and Dynamic Tax Revenue (Layer 4-5 of Macro Extension)