We consider a portfolio optimization problem in a Black-Scholes model with n stocks, in which an investor faces both fixed and proportional transaction costs. The performance of an investment strategy is measured by the average return of the corresponding portfolio over an infinite time horizon....

During the last decade, markets for covered warrants (bank-issued options) have flourished in Europe and Asia. In these markets, investors often face a choice between many instruments that differ only slightly from each other. Based on retail trades in call options on the German DAX index, this...

Why do political constituencies delegate decision power to representative assemblies? And how is the size of such assemblies determined? We analyze these questions of constitutional design in a model with voters learning their preferred alternative only after engaging in costly information...

Information costs and regulatory barriers are the main distinguishing features of international financial markets as compared to national financial markets. This paper presents a simple model of the impact of these factors on banks' cross-border activities and provides empirical evidence. Our...

If the technological revolution which has taken place over the past decades has lowered information costs and if information costs increase in distance, distance should – ceteris paribus – become less important in determining international bank lending. We are using a dataset on assets and...

The German financial system is characterized by lower degrees of penetration by foreign commercial banks and of (bank) disintermedation than, for instance, that of the United States. These differences between the two countries could be attributed to the fact that universal banking in Germany...

Although domestic mergers and acquisitions (M&As) in the financial services industry have increased steadily over the past two decades, international M&As were relatively rare until recently. This paper uses a novel dataset of over 2,300 mergers that took place between 1978 and 2001 to analyse...

We study mergers in a market where N firms sell a homogeneous good and consumers search sequentially to discover prices. The main motivation for such an analysis is that mergers generally affect market prices and thereby, in a search environment, the search behavior of consumers. Endogenous...

I examine a search model a la' Burdett and Judd (1983). Consumers are embedded in a consumers network, they may costly search for price quotations and the information gathered are non-excludable along direct links. This allows me to explore the effect of endogenous consumers externalities on...

We study a consumer non-sequential search oligopoly model with search cost heterogeneity. We first prove that an equilibrium in mixed strategies always exists. We then examine the nonparametric identification and estimation of the costs of search. We find that the sequence of points on the...