The aim of this paper is to understand the interactions between productive effort and the creation of synergies that are the sources of technological collaboration agreements, agglomeration, social stratification, etc. We model this interaction in a way that allows us to characterize how agents...

Conventional segregation indices indicate complete integration when the proportion of minorities in a metropolitan area is replicated in any subarea. However, this would not occur, even absent discrimination, because majorities and minorities have different distributions of other...

Delinquents are embedded in a network of relationships. Social ties among delinquents are modeled by means of a graph where delinquents compete for a booty and benefit from local interactions with their neighbors. Each delinquent decides in a non-cooperative way how much delinquency effort he...

Delinquents compete with each other in criminal activities but benefit from being friends with other criminals by learning and acquiring proper know-how on the crime business. We study the subgame-perfect Nash equilibrium of this game in which individuals decide first to work or to become a...

This paper examines the importance of the distribution of consumers in Hotelling's circle on the comparison between the optimal and the market equilibrium levels of diversity. It finds that when most consumers are located very close to the firms, the result of Salop - that the equilibrium number...

Workers are embedded within a network of social relationships and can communicate through word-of-mouth. They can find a job either directly or through personal contacts. From this micro scenario, we derive an aggregate matching function that has the standard properties but fails to be...