Traditional analyses of redistributive effects of the tax-benefit system are rooted in the concepts of relative income inequality and proportionality. This observation also applies to decompositions proposed by Kakwani (1977, 1984) and Lambert (1985) that reveal the vertical and horizontal...

We impose a horizontal equity restriction on the problem of finding the optimal utilitarian tax mix. The horizontal equity constraint requires that individuals with the same ability have to pay the same amount of taxes regardless of their preferences for leisure. Contrary to normal findings, we...