The Alchian-Allen substitution theorem states that an increase of the prices of two similar goods by the same amount leads to a relative increase in the compensated demand of the more expensive good. In this paper we generalize this theorem to ordinary demand functions and show under which...

We explore the implications of the generalised Alchian–Allen theorem for the labour-leisure-child-care decision of a mother with young children. In this framework we find: (i) For mothers who work only a few hours a week, a rise in wages arguably increases the demand for leisure relative to...

Models with event risk (the possibility of sudden large price movements) have proven important for option pricing (e.g., Bates (1996))and optimal portfolio selection (e.g., Liu, Longstaff and Pan(2003)). However, most of the existing studies ignore transaction costs which are prevalent in almost...

Contrary to the prediction of standard portfolio diversification theory, most investors place a large fraction of their stock investment in a small number of stocks. We show that underdiversification may be caused by risk control. The key assumption is that investors are portfolio insurers who...

Conflicts of interest between insiders (e.g, controlling shareholders) and outsiders (e.g., minority shareholders) are central to the analysis of modern corporation. In an integrated continuous-time contingent claims framework with imperfect corporate governance, we examine a controlling...

We study strategies of credit card companies. Due to lack of the ability to observe consumer types credit card companies under competition resort to aggressive strategies, oversupplying the credit card market. A sample and a population shift cause increase in credit risk, but credit card...

Bilateral supply contracts are widely used despite the presence of spot markets. In this paper we provide a potential explanation for this prevalence of supply contracts even when spot markets are liquid and without delivery lag. Specifically, we consider the determination of an equilibrium...

We consider the optimal portfolio selection problem for a constant relative risk aversion (CRRA) investor who derives utility from his terminal wealth. The stock returns are predictable, but the predictive variables are only periodically observable with noise. We obtain the investor's value...

This paper models how imperfect memory affects the optimal continuity of policies. We examine the choices of a player (individual or firm) who observes previous actions but cannot remember the rationale for these actions. In a stable environment, the player optimally responds to memory loss with...

We provide a nonparametric 'revealed preference' characterization of rational household behavior in terms of the collective consumption model, while accounting for general (possibly non-convex) individual preferences. We establish a Collective Axiom of Revealed Preference (CARP), which provides...