@techreport{YokoteCasajus, type = {Working Paper}, author = {Koji Yokote and Andr{\´e} Casajus}, title = {Weak differential monotonicity, flat tax, and basic income}, series = {HHL Working paper}, institution = {HHL Leipzig Graduate School of Management}, address = {Leipzig}, pages = {9}, abstract = {We suggest a weak version of differential monotonicity for redistribution rules: whenever the differential of two persons’ income weakly increases, then their post-redistribution rewards essentially change in the same direction. Together with efficiency, non-negativity, and the null society property, weak differential monotonicity essentially characterizes redistribution via taxation at a …fixed rate and equal distribution of the total tax revenue, i.e., a flat tax and a basic income.}, language = {en} }