If the allocations of a differential information economy are defined as incentive compatible state-contingent lotteries over consumption goods, competitive equilibrium allocations exist and belong to the (ex ante incentive) core. Furthermore, any competitive equilibrium allocation can be viewed...

As norms and tastes adapt to the social conditions shaped by policy variables, voters' opinions about these policies may evolve as well. We show how this process can lead to political instability. Moreover, if a politician's platform is shaped opportunistically so as to gain the majority's...

In their seminal paper, Mertens and Zamir (1985) proved the existence of a universal Harsanyi type space which consists of all possible types. Their method of proof depends crucially on topological assumptions. Whether such assumptions are essential to the existence of a universal space remained...