It is well known that a competititve equilibrium may fail to exist when preferences are possibly satiated. We show that this non-existence problem does not arise if one of the commodities is paper money. Moreover, an equilibrium is Pareto efficient in the economy with money. This paper therefore...

In recent years there has been a growing theoretical, experimental and empirical challenge to Expected Utility Theory, the overwhelmingly dominant paradigm for modeling decision-making under risk. However, there has been relatively little work done in providing easily parameterized alternatives...

At a Rational Expectations Equilibrium (REE), individuals are assumed to know the map from states to prices. This hypothesis has two components, that agents agree (consensus), and that they have point expectations (degeneracy). We consider economies where agents' beliefs are described by a joint...

In a finite state world with subjective expected utility maximizers, there is an unambiguous notion of what it means to know event: an event is known if it is assigned probability one. But when should a non-expected utility maximizer be said to know an event? Consider a lexicographic expected...