A large empirical literature found that the correlation between insurance purchase and ex post realization of risk is often statistically insignificant or negative. This is inconsistent with the predictions from the classic models of insurance a la Akerlof (1970), Pauly (1974) and Rothschild and...

Drug pricing in the U.S. is a persistently vexing policy problem. While there is agreement among many policy analysts that supra competitive prices are necessary to promote innovation; significant disagreements arise over how much pricing discretion prescription drug manufacturers should be...

In most sectors, technological progress boosts efficiency. But financial technology and the associated data-intensive trading strategies have been blamed for market inefficiency. A key cause for concern is that better technology might induce traders to extract other's information from order flow...

We study the effect of trading costs on information aggregation and acquisition in financial markets. For a given precision of investors' private information, an irrelevance result emerges when investors are ex-ante identical: price informativeness is independent of the level of trading costs....

A plot of expected returns versus betas obeys virtually no relation to an inefficient index portfolio's mean-variance location. If the index portfolio is inefficient, then the coefficients and R- squared from an ordinary-least-squares regression of expected returns on betas can equal essentially...

In the Medicare Advantage (MA) market, private health insurers compete to offer plans with the most attractive premium and benefit package. Medicare provides a subsidy, based on a "benchmark payment rate", for each Medicare beneficiary a plan enrolls. We investigate how this subsidy, the primary...

We study a model where some agents have private information about risky asset returns and trade to obtain capital gains, while others acquire the risky asset and hold it to maturity, forming expectations of returns based on market prices. We show that under such a structure, in addition to fully...

We analyze a novel method for improving the efficiency of pollution permit markets by optimizing the way in which emissions are exchanged through trade. Under full-information, it is optimal for emissions to exchange according to the ratio of marginal damages. However, under a canonical model...

This paper develops a stochastic equilibrium model of an open economy incorporating speculation in the forward exchange market. The model is used to examine two issues. The first is the role of speculation in stabilizing the economy against stochastic disturbances. Much risk averse speculation...