theorem williamson_special_case (J : ℕ) : -- At ρ = 0 (Cobb-Douglas): K = (J-1)/J curvatureK J 0 = (↑J - 1) / ↑J := by simp [curvatureK, one_mul]
thesis/CESProofs/Potential/FirmScope.lean:100
Propositions 12-17 and Corollary 5: