We study the value of public information in competitive economies with incomplete asset markets. We show that generically the welfare effect of a change in the information available prior to trading can be in any direction: there exist changes in information that make all agents better off, and...

In this paper we provide a characterization of the welfare properties of rational expectations equilibria of economies in which, prior to trading, agents have some information over the realization of uncertainty. We study a model with asymmetrically informed agents, treating symmetric...

A number of economists have supported the taxation of speculation in financial markets. We examine the welfare economics of such a tax in a model of trading in a nancial market where some agents have superior information. We show that in some cases a tax on speculators may actually increase...

A speculative security is an asset whose payoff depends on a random shock uncorrelated with economic fundamentals (a sunspot) about which some traders have superior information. In this paper we show that agents may find it desirable to trade such a security in spite of the fact that it is a...

A number of economists have supported the taxation of speculation in financial markets. We examine the welfare economics of such a tax in a model of a financial market where some agents have superior information and others have a hedging motive. We show that a tax on speculators may actually...

This paper provides an existence theorem for rational expectations equilibria that aggregate information imperfectly. It studies a general equilibrium model of a static exchange economy with incomplete asset markets and finitely revealing equilibria exist, provided assets have nominal payoffs...

A speculative security is an asset whose payoff depends in part on a random shock uncorrelated with economic fundamentals (a sunspot) about which some traders have superior information. In this paper we show that agents may find it desirable to trade such a security in spite of the fact that it...

This paper studies the welfare economics of informed trading in a stock market. We model the effect of more informative prices on investment, given that this dependence will itself be reflected in equilibrium prices. We show that in rational expectations equilibrium with price-taking competitive...