Cultural Group Selection and the Evolution of Reindeer Herding in Norway.

Herding can be characterized as a coordination game with two strategies for minimising risk: increase herd size (livestock quantity) or increase livestock body mass (livestock quality). In this paper I demonstrate that the selection of herd maximisation as a risk management strategy in the Northern parts of Norway has been influenced by a history of intra-group competition exacerbating herder conflict and lack of trust. In the South herder-farmer conflicts have increased herder coordination and trust, resulting in the selection of increasing livestock quality as the dominant risk management strategy. [ABSTRACT FROM AUTHOR]