theorem income_ratio_from_ces {a_i a_j x_i x_j ρ : ℝ} : incomeRatio a_i a_j x_i x_j ρ = (a_i / a_j) * (x_i / x_j) ^ ρ := by rfl
thesis/CESProofs/Applications/Inequality.lean:70
CES Inequality Decomposition