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Xavier Ruiz del Portal


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First Name: Xavier
Middle Name:
Last Name: Ruiz del Portal

RePEc Short-ID: pru149

Email: [This author has chosen not to make the email address public]
Postal Address:


Departament d'Economia Aplicada
Universitat de Lleida
Location: Lleida, Spain
Phone: 973 70 33 41
Fax: 973 70 33 00
Postal: Campus de Cappont, C. de Jaume II, 73, 25001 Lleida
Handle: RePEc:edi:deudles (more details at EDIRC)


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  1. X. Ruiz del Portal, 2012. "Conditions for incentive compatibility in models with multidimensional allocation functions and one-dimensional types," Review of Economic Design, Springer, Springer, vol. 16(4), pages 311-321, December.
  2. X. Ruiz del Portal, 2012. "On the Direct Versus Indirect Taxation Controversy," Hacienda Pública Española, IEF, IEF, vol. 203(4), pages 9-22, December.
  3. Ruiz del Portal, X., 2012. "On the implementability of contracts without quasilinear utility," Economics Letters, Elsevier, Elsevier, vol. 116(1), pages 42-45.
  4. X. Ruiz del Portal, 2011. "Agency problems with non-smooth decision profiles: the case of monopoly under product quality," SERIEs, Spanish Economic Association, Spanish Economic Association, vol. 2(1), pages 121-137, March.
  5. Ruiz del Portal, X., 2010. "On the qualitative properties of the optimal income tax," Mathematical Social Sciences, Elsevier, Elsevier, vol. 59(3), pages 288-298, May.
  6. Ruiz del Portal, X., 2009. "A general principal-agent setting with non-differentiable mechanisms: Some examples," Mathematical Social Sciences, Elsevier, Elsevier, vol. 57(2), pages 262-278, March.
  7. Ruiz del Portal, X., 2008. "Is the optimal income tax regressive?," Economics Letters, Elsevier, Elsevier, vol. 100(3), pages 402-404, September.
  8. X. RUIZ del PORTAL, 2007. "The Problem of Optimum Income Taxation: A Remark on Its Monotonicity Constraint," Journal of Public Economic Theory, Association for Public Economic Theory, Association for Public Economic Theory, vol. 9(2), pages 265-283, 04.


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