We develop a game theoretic model to analyze the Nash equilibrium of vaccine decisions in a hospital population with heterogeneous contacts. We use the model in conjunction with person-to-person contact data within a large university hospital. We simulate, using agent-based models, the...

We study the public goods problem associated with vaccinations. The externality created by an infection is composed of two parts, the probability of infection and the marginal infections generated if infected. We argue that the key component in a successful vaccination strategy is the second of...

In this tutorial we present some basic ideas behind the notion of Small World. We review the state-of-the-art in the field, and put emphasis on some recent developments, in connection with analyzing the structure of the Web.

In this tutorial we present some basic ideas behind the notion of Small World. We review the state-of-the-art in the field, and put emphasis on some recent developments, in connection with analyzing the structure of the Web.

We present explicit convex programs which characterize the equilibrium for certain additively separable utility functions and CES functions. These include some CES utility functions that do not satisfy weak gross substitutability.

A number of combinatorial problems of interest to computational economists, such as some two-sided matching problems, belong to the complexity class NP. The best known solutions to these problems require exponential computation time in the size of the input, and are intractable in practice...