theorem fold_marginalK_pos {J_fold ρ : ℝ} (hJ : 0 < J_fold) (hρ : ρ < 1) : 0 < marginalK J_fold ρ := pigouvian_subsidy_pos hJ hρ
thesis/CESProofs/Dynamics/RegimeShift.lean:54
Paper 3c, Section 3: First-Order Regime Shift