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Taxing Humans: Pitfalls of the Mechanism Design Approach and Potential Resolutions

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  • Alex Rees-Jones
  • Dmitry Taubinsky

Abstract

A growing body of evidence suggests that psychological biases can lead different implementations of otherwise equivalent tax incentives to result in meaningfully different behaviors. We argue that in the presence of such failures of "implementation invariance," decoupling the question of optimal feasible allocations from the tax system used to induce them--the "mechanism design approach" to tax analysis--cannot be the right approach to analyzing optimal tax systems. After reviewing the diverse psychologies that lead to failures of implementation invariance, we illustrate our argument by formally deriving three basic lessons that arise in the presence of these biases. First, the mechanism design approach neither estimates nor bounds the welfare computed under psychologically realistic assumptions about individuals' responses to the tax instruments used in practice. Second, the optimal allocations from abstract mechanisms may not be implementable with concrete tax policies, and vice versa. Third, the integration of these biases may mitigate the importance of information asymmetries, resulting in optimal tax formulas more closely approximated by classical Ramsey results. We conclude by proposing that a "behavioral" extension of the "sufficient statistics" approach is a more fruitful way forward in the presence of such psychological biases.

Suggested Citation

  • Alex Rees-Jones & Dmitry Taubinsky, 2018. "Taxing Humans: Pitfalls of the Mechanism Design Approach and Potential Resolutions," Tax Policy and the Economy, University of Chicago Press, vol. 32(1), pages 107-133.
  • Handle: RePEc:ucp:tpolec:doi:10.1086/697139
    DOI: 10.1086/697139
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    More about this item

    JEL classification:

    • D03 - Microeconomics - - General - - - Behavioral Microeconomics: Underlying Principles
    • D6 - Microeconomics - - Welfare Economics
    • H0 - Public Economics - - General
    • H2 - Public Economics - - Taxation, Subsidies, and Revenue
    • H21 - Public Economics - - Taxation, Subsidies, and Revenue - - - Efficiency; Optimal Taxation

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