There is a large literature in economics and elsewhere on the emergence and evolution of cooperation in the repeated Prisoner's Dilemma. Recently this literature has expanded to include cooperation in spatial prisoner dilemma games where agents play only with local neighbors in a specified...

Skyscrapers in Manhattan must be anchored to bedrock to prevent (possibly uneven) settling; this can potentially increase construction costs if the bedrock lies deep below the surface. The conventional wisdom holds that Manhattan developed two business centers—downtown and...

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 paper, we characterize all interior and boundary equilibria of the Groves- Ledyard mechanism for a large class of economies and demonstrate their stability or lack thereof. We prove that the mechanism implements large numbers of inefficient and stable boundary equilibria, one for each of...