The note points out some restrictions imposed by the notion of ratification. This notion is widely used in the mechanism design literature that assumes that each agent has a veto power. We exhibit allocations that are note ratifiable and nevertheless can be implemented through a mechanism that...

This paper analyzes the optimal choice of pricing schedules and technological deterrence levels in a market with digital piracy, when legal sellers can sometimes control the extent of piracy by implementing digital rights management (DRM) systems. It is shown that the seller's optimal pricing...

First, this article uses standard welfare economics to illustrate the market failure and policy coordination problems caused by transboundary pollution problems in general and global warming in particular. Secondly, a brief overview is given of the main results obtained by empirical modelling...