Birthplace diversity and team performance
利用德国男子足球顶级联赛7208场比赛和3266名球员的数据，研究发现出生地多样性对团队绩效呈倒U型影响，即适度多样性提升绩效，过高则因沟通障碍而降低。
Using hand-collected and web-scraped data on 7208 matches and 3266 players from the highest division of German male football, this paper examines how birthplace diversity affects team performance. The results of two instrumental variable analyses suggest that birthplace diversity has a hump-shaped effect on team performance. To explain our result, we argue that nationally diverse teams have a wider range of skills and face greater communication barriers.