In this paper, virtual implementation is restricted so that only a socially optimal outcome or some fixed outcome (a status quo) can be delivered on the equilibrium path. Under such a restriction, any unanimous and implementable social choice function is almost-dictatorial. That is, there is an...

We give a short and direct proof of Arrow's Impossibility Theorem. We shall show that unanimity and independence of irrelevant alternatives implies a preference invariance (PI) property for the social welfare function. Then we show that the PI property and unanimity imply the existence of a...

Modern features of chaotic structuring economy, which implies openness, uncertainty, dynamism and self-organization and fundamentally new requirements of the Information Society, require the creation and study of new approaches to management accounting in informational aspect. In general, modern...

In this paper we consider the exogenous indifference classes model of Barbera and Ehlers (2011) and Sato (2009) and analyze further the relationship between the structure of indifference classes across agents and dictatorship results. The key to our approach is the pairwise partition graph. We...