| Is the optimal income tax regressive? XR del Portal Economics Letters 100 (3), 402-404, 2008 | 14 | 2008 |
| The problem of optimum income taxation: a remark on its monotonicity constraint X Ruiz del Portal Journal of Public Economic Theory 9 (2), 265-283, 2007 | 14 | 2007 |
| On the qualitative properties of the optimal income tax XR del Portal Mathematical Social Sciences 59 (3), 288-298, 2010 | 9 | 2010 |
| Non‐smooth monotonicity constraints in optimal control problems: Some economic applications X Ruiz del Portal Optimal Control Applications and Methods 32 (4), 396-413, 2011 | 8 | 2011 |
| A general principal–agent setting with non-differentiable mechanisms: Some examples XR del Portal Mathematical Social Sciences 57 (2), 262-278, 2009 | 8 | 2009 |
| On the implementability of contracts without quasilinear utility XR del Portal Economics Letters 116 (1), 42-45, 2012 | 5 | 2012 |
| Optimal mixed taxation, public goods and the problem of high-skilled emigration X Ruiz del Portal Journal of Economics 122, 97-119, 2017 | 4 | 2017 |
| On the Direct Versus Indirect Taxation Controversy X Ruiz del Portal Hacienda Pública Española/Review of Public Economics 203 (4), 9-22, 2012 | 4 | 2012 |
| Conditions for incentive compatibility in models with multidimensional allocation functions and one-dimensional types X Ruiz del Portal Review of Economic Design 16, 311-321, 2012 | 2 | 2012 |
| Two reasons for not using commodity taxation in the presence of an optimal income tax X Ruiz del Portal Instituto de Estudios Fiscales, 2020 | 1 | 2020 |
| Optimal income taxation with mobility between the legal and black labour markets X Ruiz del Portal Available at SSRN 2588178, 2015 | 1 | 2015 |
| Optimal Mixed Taxation, Public Goods and the Problem of Migration by the Highly Skilled X Ruiz del Portal Public Goods and the Problem of Migration by the Highly Skilled (January 14 …, 2015 | 1 | 2015 |
| Agency problems with non-smooth decision profiles: the case of monopoly under product quality X Ruiz del Portal SERIEs 2 (1), 121-137, 2011 | 1 | 2011 |
| Optimal Mixed Taxation: Some Further Results X Ruiz del Portal Available at SSRN 4058727, 2022 | | 2022 |
| Policies Against Tax Evasion Through Ocupational Choice X Ruiz del Portal Available at SSRN 3561516, 2020 | | 2020 |
| Uniform vs Differential Excise Taxation Under the Second-Order Approach X Ruiz del Portal Available at SSRN 3478348, 2019 | | 2019 |
| Tax Evasion with Mobility between the Regular and Irregular Sectors X Ruiz del Portal Available at SSRN 3145125, 2018 | | 2018 |
| Optimal mixed taxation, public goods and the problem of high-skilled emigration (vol 122, pg 97, 2017) X Ruiz del Portal JOURNAL OF ECONOMICS 122 (2), 197-197, 2017 | | 2017 |
| Dealing with Monotonicity Constraints in Screening Problems: The Principal-Agent Model XR del Portal Far East Journal of Mathematical Sciences 101 (2), 215, 2017 | | 2017 |
| Uniform vs Differential Excise Taxes Under the Second-Order Approach X Ruiz del Portal Available at SSRN 2754849, 2016 | | 2016 |
