The Atkinson-Stiglitz Theorem states that if labor is weakly separable from goods in household utility functions, differential commodity taxation should not be not part of an optimal redistributive tax system. This Theorem, which is arguable the most policy-relevant result to come out of the...

This paper considers redistributive as well as political consequences of tax avoidance. When investing in tax avoidance is possible, the official tax rate does not necessarily correspond to what individuals actually pay in taxes. This affects both redistributive outcomes as well as individual's...

The paper provides a new formulation of the Mirrlees-Seade theo- rem on the positivity of the optimal marginal income tax, under weaker assumptions and in a more general model. The formulation of the the- orem is independent of whether the model involves finitely many types or a continuous type...

The paper provides a new proof of the positivity of the optimal marginal income tax, in a more general model, under weaker assumptions. The analysis focusses on the (weakly) relaxed problem in which upward incentive constraints are replaced by a monotonicity condition on consumption. Without...

Die Einführung des 9‑Euro-Tickets (9ET) im Sommer 2022 stellte für Politik und Forschung ein aufschlussreiches Realexperiment dar. Wir untersuchen auf Basis von Daten aus einer bundesweiten Online-Befragung im Juli 2022 (1347 Befragte, quotiert), wer das Ticket nachgefragt und wie sich die...

This paper explores whether more generous social spending polices in fact lead to less income inequality, or if redistributive outcomes are offset by behavioral disincentive effects. To account for the inherent endogeneity of social policies with regard to inequality levels, I apply the System...

This paper studies optimal linear income taxation and redistributive social insurance when the former has the traditional labor distortion and the latter generates both ex ante and ex post moral hazard. Private insurance is available and individuals differ in labor productivity and in loss...