巧了，这两天刚刚在读这类体育赛事经济机制的论文。
这篇名叫「The Economic Design of Sporting Contests」的综述就提到了这个。
对于北美类型的联盟，他给的共同描述是这样的：
1. Organizational independence of the domestic major leagues
2. a fixed number of teams
3. entry through the sale of expansion franchises
4. exclusive territories and franchise mobility
5. draft rules giving teams monopsony rights in player acquisition
6. roster limits
7. low player mobility and limited player trading
