Pareto efficiency for the concave order and multivariate comonotonicity

Guillaume Carlier (1) , Rose-Anne Dana (1) , Alfred Galichon (2)

1 CEREMADE - CEntre de REcherches en MAthématiques de la DEcision
2 ECON - Département d'économie (Sciences Po)

This paper studies efficient risk-sharing rules for the concave dominance order. For a univariate risk, it follows from a comonotone dominance principle, due to Landsberger and Meilijson (1994), that efficiency is characterized by a comonotonicity condition. The goal of the paper is to generalize the comonotone dominance principle as well as the equivalence between efficiency and comonotonicity to the multidimensional case. The multivariate case is more involved (in particular because there is no immediate extension of the notion of comonotonicity), and it is addressed by using techniques from convex duality and optimal transportation.

Domains: Economics and Finance

Guillaume Carlier, Rose-Anne Dana, Alfred Galichon. Pareto efficiency for the concave order and multivariate comonotonicity. Journal of Economic Theory, 2012, 147 (1), pp.207-229. ⟨10.1016/j.jet.2011.11.011⟩. ⟨hal-01053549⟩