Delinquents are embedded in a network of relationships. Each delinquent decides in a non-cooperative way how much delinquency effort he will exert. We characterize the Nash equilibrium and derive an optimal enforcement policy, called the key-player policy. We then extend our characterization of...

Using the UK Fourth National Survey of Ethnic Minorities, we document differences in integration patterns between Muslims and non-Muslims. We find that Muslims integrate less and more slowly than non-Muslims. In terms of estimated probability of having a strong religious identity, a Muslim born...

This paper aims to explain the spatial variations of crime, both between and within cities. Two types of mechanisms are put forward: Social interactions that stipulate that an individual is more likely to commit crime if his peers commit than if they do not commit crime, and distance to jobs...