This paper studies efficient risk-sharing rules for the concave dominance order. For a univariate risk, it follows from … because there is no immediate extension of the notion of comonotonicity), and it is addressed by using techniques from convex …

of assets with short-selling where there is risk and ambiguity. Agents have Bewley’s incomplete preferences. As an … of the risk adjusted sets of probabilities intersect. The more risk averse, the more ambiguity averse the agents, the …

The theory of existence of equilibrium with short-selling is reconsidered under risk and ambiguity modelled by risk … averse variational preferences. No-arbitrage conditions are given in terms of risk adjusted priors. A sufficient condition … for existence of efficient allocations is the overlapping of the interiors of the risk adjusted sets of priors or the …

The theory of existence of equilibrium with short-selling is reconsidered under risk and ambiguity modelled by risk … of the risk adjusted sets of expectations overlap. This condition is necessary if agents are not risk neutral at extreme … compatible trades, with non negative expected value with respect to any risk adjusted prior, strictly positive for some agent and …