In European Welfare States, unskilled workers are typically unionized, while the wage formation of skilled workers is more competitive. To focus on this aspect, we analyze how flexible international outsourcing and labour taxation affect wage formation, employment and welfare in dual domestic...

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This paper isolates the causal effect of policing on group violence, using unique panel data on self-reported crime by soccer and ice hockey hooligans. The problem of reverse causality from violence to policing is solved by two drastic reallocations of the Stockholm Sport Intelligence and...

In this paper, we introduce a model of hooliganism to study how different types of policing can be expected to affect violence and the number of hooligans in violent supporter clubs. Hooligans differ in their preferred level of fighting, and obtain utility also from social identity that...

In this paper, we study how unemployment affects gang crime. We examine a model of criminal gangs and suggest that a substitution effect between petty crime and severe crime is at work. In the model, non-monetary valuation of gang membership is private knowledge. Thus, the leaders face a...

Democratic societies are challenged by various violent and organized groups, be they terrorists, gangs or organized hooligans. In exchange for offering an identity, leaders in such groups typically require members to be violent. We introduce a simple model to capture these stylized facts, and...

This paper isolates the causal effect of policing on group violence, using unique panel data on self-reported crime by soccer and ice hockey hooligans. The problem of reverse causality from violence to policing is solved by two drastic reallocations of the Stockholm Supporter Police unit to...

Empirical evidence reveals that unemployment tends to increase property crime but that it has no effect on violent crime. To explain these facts, we examine a model of criminal gangs and suggest that there is a substitution effect between property crime and violent crime at work. In the model,...