We investigate the issue of strategic substitutability/complementarity in a Cournot differential game with sticky prices. We show that first order conditions do not produce instantaneous best reply functions. However, we identify negatively sloped reaction functions in steady state, with the open-loop best reply being flatter than its closed-loop counterpart. JEL classification: C73, D43, D92, ...

Fraud is an ancient crime and one that annually causes hundreds of billions of dollars in losses. We examine the behavioral patterns over time of different types of frauds, which illustrate cyclical frequencies. We develop an evolutionary theory that suggests cyclic behavior in frauds should be common. JEL classifications: D92, L15, P17

Escherichia coli is suspected to be involved with Crohn's disease. Adherence and invasion to epithelial cells are properties commonly observed in these bacteria. Here, we present a draft genome sequence of E. coli D92/09, a multidrug-resistant strain, which besides showing these properties produces Shiga cytotoxin-1 and possibly other toxins.

We investigate the issue of strategic substitutability/complementarity in differential games. We prove that instantaneous best replies exist if Hamiltonian functions are multiplicative in the control variables. Otherwise, if the Hamiltonians are addively separable w.r.t. controls, a dominant strategy emerges for each player. In this case, however, imposing stationarity on the differential equat...

We examine the impact of retirement exibility and the constraint against borrowing from future labor income on optimal consumption, optimal investment, and optimal retirement policy. We solve three alternative models almost explicitly in parametric forms (up to at most a constant) and provide veri cation theorems for the claimed solutions. In addition, we also obtain analytical comparative stat...

The application of Samuelson's theorem on value invariance to the case of intertemporally optimizing "rms is shown to require a judiciously chosen economic depreciation formula which depends on both current stock and current #ow variables, in order to prevent the "rms from changing their actions in the face of the tax regime. We illustrate by deriving depreciation rules which achieve non-distor...

We illustrate two di¤erential oligopoly games using, respectively, the capital accumulation dynamics à la Nerlove-Arrow, and the capital accumulation dynamics à la Ramsey. We prove that these games bene...t from the property that closed-loop memoryless solutions degenerate into open-loop solutions, since the best reply of a generic ...rm is independent of the rivals’ state variables, which enta...

We study financial intermediation in which sufficient sorting is impossible. We identify a new type of market failure that may occur even when returns of investing entrepreneurs are verifiable. Moreover, we suggest that the nature of competition determines the contracts banks offer. A monopoly bank will offer equity contracts. In any pure strategy equilibrium when lenders compete à la Bertrand,...