theorem strategic_complementarity_full {J ρ c : ℝ} (hJ : 1 < J) (hρ0 : 0 < ρ) (hρ1 : ρ < 1) (hc : 0 < c) : 0 < valueFunctionDeriv J ρ c := valueFunctionDeriv_pos hJ hρ0 hρ1 hc
thesis/CESProofs/EntryExit/Equilibria.lean:37
Paper 1c, Section 3: The Participation Game