In this paper, we consider an investor who plays in a market that involves a risky asset whose instantaneous rate of return changes at unknown random times. This return rate is assumed to follow the law of a Compound Poisson Process. We construct optimal mathematical strategies in this context...

During the last decade, a surprisingly high percentage of U.S. companies has fulfilled or beatenanalysts´ earnings per share forecasts. One of the most frequently cited reasons for this growingtendency is a change in the nature of U.S. executive compensation structure. As stock options...

This paper investigates the price and volume behavior around buy, sell and holdrecommendations of Swiss stocks, as published in the major financial newspaper in Switzerland. This represents a random selection of recommendations which have been previously released by banks to their customers....

We examine the underpricing and long-term performance of a broad set ofSwiss IPOs from 1983 to 2000. The average market adjusted initial return is34.97%. Our results support the ex ante uncertainty hypothesis, the signal-ling hypothesis and, to some extent, the market cyclicality hypothesis...

We analyse questions of arbitrage in financial markets in which asset prices change in time as stationary stochastic processes. The main focus of the paper is on a model where the price vectors are independent and identically distributed. In the framework of this model, we find conditions that...

We aim to compare financial technical analysis techniques to strategies which depend on a mathematical model. In this paper, we consider the moving average indicator and an investor using a risky asset whose instantaneous rate of return changes at an unknown random time. We construct...

Considered here is on-line portfolio management aimed at maximizing the long-run growth of financial wealth. The portfolio is repeatedly rebalanced in response to observed returns on diverse assets. Suppose statistical information and related methods are not available - or deemed too diffcult....

The paper shows that financial market equilibria need not exist if agents possess cumulative prospect theory preferences with piecewise-power value functions. The reason is an infiniteshort-selling problem. But even when a short-sell constraint is added, non-existence can occur due to...

This paper investigates model risk issues in the context of mean-variance portfolio selection. We analytically and numerically show that, under model misspecification, the use of statistically robust estimates instead of the widely used classical sample mean and covariance is highly beneficial...

We conduct controlled experiments in order to analyze individual trading behavior. Our results suggest that investors measure their gains relative to their initial wealth, and that this reference point together with past stock price changes determine the portfolio choices. Subjects choose a...