We humans engage in a lot of costuming that can often be interpreted as type communication. Uniforms are the obvious example (cops on the beat, for example, wear uniforms because they want us to know that they are cops), but there are many other examples. This paper models costuming, or image...

We argue that the effectiveness of capital as an entry barrier depends critically on its durability and that this aspect of capital has been largely ignored. We examine strategic decisions with respect to capital durability in two models. In a broad range of cases an active policy with respect...

This article sets out a theory of market structure with sequential entry. We characterize the perfect Nash equilibrium to the entry game in several propositions. First, equilibria never involve excess capacity. Second, a sufficient statistic for the entry of any firm is that its profits are...

We develop a general equilibrium model of crime in which honest workers face an effective tax rate on earnings, consisting of an exogenous income tax, used to pay for policing, and an endogenous crime tax, given by the proportion of their disposable income that is stolen. When there are two...

A social dilemma is, in essence, a prisoners' dilemma in a continuous strategy space. I discuss a number of social dilemmas that have caught my attention, offer an elementary, diagrammatic synthesis of them, and discuss some of the economic insights that the diagrams capture, including...

We provide a model of know-how sharing between competing firms in which each of two firms gets a stochastic innovation in its stock of know-how in every period. Separately considering the cases when innovations are indivisible and divisible, we examine the nature of the subgame perfect sharing...