This paper develops a model of a professional sports league with network externalities by integrating the theory of two-sided markets into a contest model. In professional team sports, the competition of the clubs functions as a platform that enables sponsors to interact with fans. In these...

This paper develops a formal model of a cooperative enterprise which explains why cooperatives are present in such a large number of sectors. In our model of a multi-stage production process, we account for the possibility that producers can acquire knowledge to decrease their cost of...