theorem factorShare_symmetric_uniform {J : ℕ} (hJ : 0 < J) {ρ : ℝ} {c : ℝ} (hc : 0 < c) :
∀ j : Fin J, factorShare J (fun _ => (1 : ℝ) / ↑J) ρ (symmetricPoint J c) j = 1 / ↑J := by
intro j
simp only [factorShare, symmetricPoint]
have hJpos : (0 : ℝ) < ↑J := Nat.cast_pos.mpr hJ
have hJne : (↑J : ℝ) ≠ 0 := ne_of_gt hJpos
have hcρ : (0 : ℝ) < c ^ ρ := rpow_pos_of_pos hc ρ
rw [Finset.sum_const, Finset.card_univ, Fintype.card_fin, nsmul_eq_mul]
field_simpEconomics extensions for CES formalization: