Loewenstein and Prelec (1992) explain the 'magnitude effect' and the 'sign effect', respectively, by using increasing elasticity of the value function and a higher elasticity for losses as compared to gains. We provide a value function with these two properties.

With nondistortionary user charges, the first best and second best of a single-club-exogenous-income economy with identical individuals coincide. They differ if incomes differ. Overprovision of a superior club good then occurs in the Second Best.