From a theoretical point of view, the link between workplace diversity and performance in a high-skilled context is ambiguous. Likewise, empirical research at the firm or plant level finds inconclusive and context-specific results. Using a detailed database that covers all the 3,999 matches played by Italian Serie A teams (firms) over a 10-season period, our results reveal a substantial and robust negative effect of fractionalization on performance, whereas no effect is found for polarization. This article also highlights how the negative effect of fractionalization depends on the nature of the tasks to be completed, the wealth of the teams and the level of workers' experience. This work reveals some myopia in hiring practices and suggests that firms should make better decisions in choosing the optimal mix of workers.
| INTRODUCTION & MOTIVATIONChallenges such as ageing populations and labour shortages are more relevant than ever before, and high-skilled labour immigration is a potential solution to address them. Consequently, there has been increasing competition for talent worldwide, with national and regional policies being implemented in recent years not only in major Western economies but also in Asian and Latin American countries (Cerna, 2016). For each major economy, attracting highskilled talent is an important aspect of its national strategy to protect and develop its knowledge base, while, at the same time, economic and health crises and growing political tensions over immigration can be counterproductive.Most recent empirical evidence has found that more diverse high skilled migrants provide a positive economic contribution, especially in richer countries (