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The Full Pareto Frontier as Kantian Equilibria

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  • Igor Sloev
  • Gerasimos Lianos

Abstract

Multiplicative Kantian equilibrium explains cooperative behavior in social dilemmas without abandoning methodological individualism. However, its outcomes depend critically on the parametrization of the strategy space - the property of strategic non-equivalence. We investigate what fraction of the Pareto frontier can be attained by varying the strategy space. We show that the set of achievable Kantian equilibria is the entire Pareto frontier: for any interior Pareto-efficient point there exists a shift of coordinates - imposing lower bounds on actions - that makes it a Multiplicative Kantian equilibrium. The proof is constructive and relies on a intuitive geometric property: moving the origin to a point on the common tangent to players' indifference curves. This result separates the problem of efficiency from the problem of fairness, allowing any normative criterion to be implemented without loss of Pareto optimality.

Suggested Citation

  • Igor Sloev & Gerasimos Lianos, 2026. "The Full Pareto Frontier as Kantian Equilibria," Papers 2605.19548, arXiv.org.
    • Handle: RePEc:arx:papers:2605.19548
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    References listed on IDEAS

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    1. Alistair Ulph & David Ulph, 2024. "International Cooperation and Kantian Moral Behaviour: Complements or Substitutes?," Environmental & Resource Economics, Springer;European Association of Environmental and Resource Economists, vol. 87(9), pages 2205-2228, September.
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