Doerrenberg, Philipp; Peichl, Andreas; Siegloch, Sebastian - 2015
-sufficiency of the ETI, namely tax deductions. Building on a theoretical framework which incorporates deductions in a standard … optimal-tax model, we show that the ETI is not sufficient for welfare analysis if (i) deductions generate externalities and if … (ii) deductions are responsive to tax-rate changes. While the first condition should arguably hold true for the majority …